155506243505123 has 48 divisors (see below), whose sum is σ = 186010054788096. Its totient is φ = 129553462584000.

The previous prime is 155506243505117. The next prime is 155506243505167. The reversal of 155506243505123 is 321505342605551.

It is not a de Polignac number, because 155506243505123 - 2⁶ = 155506243505059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155506243505183) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 577906190 + ... + 578175212.

It is an arithmetic number, because the mean of its divisors is an integer number (3875209474752).

Almost surely, 2^{155506243505123} is an apocalyptic number.

155506243505123 is a deficient number, since it is larger than the sum of its proper divisors (30503811282973).

155506243505123 is a wasteful number, since it uses less digits than its factorization.

155506243505123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270424 (or 270417 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 47.

The spelling of 155506243505123 in words is "one hundred fifty-five trillion, five hundred six billion, two hundred forty-three million, five hundred five thousand, one hundred twenty-three".