87868752561 has 16 divisors (see below), whose sum is σ = 131112452800. Its totient is φ = 58157733024.

The previous prime is 87868752551. The next prime is 87868752563. The reversal of 87868752561 is 16525786878.

87868752561 is a `hidden beast` number, since 8 + 7 + 8 + 68 + 7 + 5 + 2 + 561 = 666.

It is not a de Polignac number, because 87868752561 - 2²³ = 87860363953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87868752563) 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 15 ways as a sum of consecutive naturals, for example, 11702716 + ... + 11710221.

It is an arithmetic number, because the mean of its divisors is an integer number (8194528300).

Almost surely, 2^87868752561 is an apocalyptic number.

It is an amenable number.

87868752561 is a deficient number, since it is larger than the sum of its proper divisors (43243700239).

87868752561 is a wasteful number, since it uses less digits than its factorization.

87868752561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23413085 (or 23413079 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 63.

The spelling of 87868752561 in words is "eighty-seven billion, eight hundred sixty-eight million, seven hundred fifty-two thousand, five hundred sixty-one".