155025978031 has 4 divisors (see below), whose sum is σ = 160026816064. Its totient is φ = 150025140000.

The previous prime is 155025978017. The next prime is 155025978059. The reversal of 155025978031 is 130879520551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155025978031 - 2³¹ = 152878494383 is a prime.

It is a super-2 number, since 2×155025978031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155025976031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500418970 + ... + 2500419031.

It is an arithmetic number, because the mean of its divisors is an integer number (40006704016).

Almost surely, 2^155025978031 is an apocalyptic number.

155025978031 is a deficient number, since it is larger than the sum of its proper divisors (5000838033).

155025978031 is an equidigital number, since it uses as much as digits as its factorization.

155025978031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000838032.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 155025978031 in words is "one hundred fifty-five billion, twenty-five million, nine hundred seventy-eight thousand, thirty-one".