155115523503 has 40 divisors (see below), whose sum is σ = 245504944080. Its totient is φ = 97264385280.

The previous prime is 155115523501. The next prime is 155115523517. The reversal of 155115523503 is 305325511551.

155115523503 is a `hidden beast` number, since 1 + 5 + 51 + 1 + 552 + 3 + 50 + 3 = 666.

It is not a de Polignac number, because 155115523503 - 2¹ = 155115523501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155115523501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2138613 + ... + 2209953.

It is an arithmetic number, because the mean of its divisors is an integer number (6137623602).

Almost surely, 2^155115523503 is an apocalyptic number.

155115523503 is a deficient number, since it is larger than the sum of its proper divisors (90389420577).

155115523503 is a wasteful number, since it uses less digits than its factorization.

155115523503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72949 (or 72940 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 36.

The spelling of 155115523503 in words is "one hundred fifty-five billion, one hundred fifteen million, five hundred twenty-three thousand, five hundred three".