155920051911 has 32 divisors (see below), whose sum is σ = 228778518528. Its totient is φ = 93855985920.

The previous prime is 155920051907. The next prime is 155920051921. The reversal of 155920051911 is 119150029551.

It is not a de Polignac number, because 155920051911 - 2² = 155920051907 is a prime.

It is a super-2 number, since 2×155920051911² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 155920051911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155920051921) 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, 3332995 + ... + 3379451.

It is an arithmetic number, because the mean of its divisors is an integer number (7149328704).

Almost surely, 2^155920051911 is an apocalyptic number.

155920051911 is a deficient number, since it is larger than the sum of its proper divisors (72858466617).

155920051911 is a wasteful number, since it uses less digits than its factorization.

155920051911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48351.

The product of its (nonzero) digits is 20250, while the sum is 39.

The spelling of 155920051911 in words is "one hundred fifty-five billion, nine hundred twenty million, fifty-one thousand, nine hundred eleven".