87765663998 has 16 divisors (see below), whose sum is σ = 132554836800. Its totient is φ = 43580820000.

The previous prime is 87765663977. The next prime is 87765664009. The reversal of 87765663998 is 89936656778.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1974923 + ... + 2018873.

It is an arithmetic number, because the mean of its divisors is an integer number (8284677300).

Almost surely, 2^87765663998 is an apocalyptic number.

87765663998 is a deficient number, since it is larger than the sum of its proper divisors (44789172802).

87765663998 is a wasteful number, since it uses less digits than its factorization.

87765663998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50803.

The product of its digits is 823011840, while the sum is 74.

The spelling of 87765663998 in words is "eighty-seven billion, seven hundred sixty-five million, six hundred sixty-three thousand, nine hundred ninety-eight".