155540623381 has 32 divisors (see below), whose sum is σ = 197042186880. Its totient is φ = 120637900800.

The previous prime is 155540623367. The next prime is 155540623391. The reversal of 155540623381 is 183326045551.

It is not a de Polignac number, because 155540623381 - 2¹⁹ = 155540099093 is a prime.

It is a super-2 number, since 2×155540623381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155540623391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586740 + ... + 809533.

It is an arithmetic number, because the mean of its divisors is an integer number (6157568340).

Almost surely, 2^155540623381 is an apocalyptic number.

155540623381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155540623381 is a deficient number, since it is larger than the sum of its proper divisors (41501563499).

155540623381 is a wasteful number, since it uses less digits than its factorization.

155540623381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396357.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 155540623381 in words is "one hundred fifty-five billion, five hundred forty million, six hundred twenty-three thousand, three hundred eighty-one".