155385174998881 has 9 divisors (see below), whose sum is σ = 155524400496723. Its totient is φ = 155246074057800.

The previous prime is 155385174998831. The next prime is 155385174998891. The reversal of 155385174998881 is 188899471583551.

The square root of 155385174998881 is 12465359.

It is a perfect power (a square), and thus also a powerful number.

155385174998881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149171023446481 + 6214151552400 = 12213559^2 + 2492820^2 .

It is not a de Polignac number, because 155385174998881 - 2³⁵ = 155350815260513 is a prime.

It is a super-2 number, since 2×155385174998881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155385174998795 and 155385174998804.

It is not an unprimeable number, because it can be changed into a prime (155385174998831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15693882031 + ... + 15693891931.

Almost surely, 2^{155385174998881} is an apocalyptic number.

155385174998881 is the 12465359-th square number.

155385174998881 is the 6232680-th centered octagonal number.

It is an amenable number.

155385174998881 is a deficient number, since it is larger than the sum of its proper divisors (139225497842).

155385174998881 is an frugal number, since it uses more digits than its factorization.

155385174998881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22320 (or 11160 counting only the distinct ones).

The product of its digits is 3483648000, while the sum is 82.

The spelling of 155385174998881 in words is "one hundred fifty-five trillion, three hundred eighty-five billion, one hundred seventy-four million, nine hundred ninety-eight thousand, eight hundred eighty-one".