155123864523 has 24 divisors (see below), whose sum is σ = 230152228800. Its totient is φ = 100608407424.

The previous prime is 155123864521. The next prime is 155123864551. The reversal of 155123864523 is 325468321551.

It is a happy number.

155123864523 is a `hidden beast` number, since 1 + 5 + 512 + 3 + 86 + 4 + 52 + 3 = 666.

It is not a de Polignac number, because 155123864523 - 2¹ = 155123864521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155123864521) 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, 3202398 + ... + 3250476.

It is an arithmetic number, because the mean of its divisors is an integer number (9589676200).

Almost surely, 2^155123864523 is an apocalyptic number.

155123864523 is a deficient number, since it is larger than the sum of its proper divisors (75028364277).

155123864523 is a wasteful number, since it uses less digits than its factorization.

155123864523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57811 (or 57808 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 155123864523 in words is "one hundred fifty-five billion, one hundred twenty-three million, eight hundred sixty-four thousand, five hundred twenty-three".