155245431321 has 24 divisors (see below), whose sum is σ = 226818577440. Its totient is φ = 102308982336.

The previous prime is 155245431307. The next prime is 155245431343. The reversal of 155245431321 is 123134542551.

155245431321 is a `hidden beast` number, since 1 + 55 + 245 + 43 + 1 + 321 = 666.

It is not a de Polignac number, because 155245431321 - 2¹⁰ = 155245430297 is a prime.

It is a super-2 number, since 2×155245431321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155245431361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3588606 + ... + 3631608.

It is an arithmetic number, because the mean of its divisors is an integer number (9450774060).

Almost surely, 2^155245431321 is an apocalyptic number.

It is an amenable number.

155245431321 is a deficient number, since it is larger than the sum of its proper divisors (71573146119).

155245431321 is a wasteful number, since it uses less digits than its factorization.

155245431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47605 (or 47602 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 155245431321 its reverse (123134542551), we get a palindrome (278379973872).

The spelling of 155245431321 in words is "one hundred fifty-five billion, two hundred forty-five million, four hundred thirty-one thousand, three hundred twenty-one".