155506643515 has 16 divisors (see below), whose sum is σ = 196518712320. Its totient is φ = 117804106080.

The previous prime is 155506643503. The next prime is 155506643521. The reversal of 155506643515 is 515346605551.

It is not a de Polignac number, because 155506643515 - 2¹⁹ = 155506119227 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161181 + ... + 580510.

It is an arithmetic number, because the mean of its divisors is an integer number (12282419520).

Almost surely, 2^155506643515 is an apocalyptic number.

155506643515 is a deficient number, since it is larger than the sum of its proper divisors (41012068805).

155506643515 is a wasteful number, since it uses less digits than its factorization.

155506643515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743922.

The product of its (nonzero) digits is 1350000, while the sum is 46.

The spelling of 155506643515 in words is "one hundred fifty-five billion, five hundred six million, six hundred forty-three thousand, five hundred fifteen".