155978896887 has 32 divisors (see below), whose sum is σ = 263047426560. Its totient is φ = 90422544960.

The previous prime is 155978896873. The next prime is 155978896897. The reversal of 155978896887 is 788698879551.

155978896887 is a `hidden beast` number, since 15 + 597 + 8 + 8 + 9 + 6 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 155978896887 - 2⁸ = 155978896631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155978896807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11410158 + ... + 11423819.

It is an arithmetic number, because the mean of its divisors is an integer number (8220232080).

Almost surely, 2^155978896887 is an apocalyptic number.

155978896887 is a deficient number, since it is larger than the sum of its proper divisors (107068529673).

155978896887 is a wasteful number, since it uses less digits than its factorization.

155978896887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22834020 (or 22834014 counting only the distinct ones).

The product of its digits is 2438553600, while the sum is 81.

The spelling of 155978896887 in words is "one hundred fifty-five billion, nine hundred seventy-eight million, eight hundred ninety-six thousand, eight hundred eighty-seven".