87192918561 has 16 divisors (see below), whose sum is σ = 133059953664. Its totient is φ = 49751567184.

The previous prime is 87192918559. The next prime is 87192918613. The reversal of 87192918561 is 16581929178.

It is not a de Polignac number, because 87192918561 - 2¹ = 87192918559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87192918361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3025221 + ... + 3053906.

It is an arithmetic number, because the mean of its divisors is an integer number (8316247104).

Almost surely, 2^87192918561 is an apocalyptic number.

It is an amenable number.

87192918561 is a deficient number, since it is larger than the sum of its proper divisors (45867035103).

87192918561 is a wasteful number, since it uses less digits than its factorization.

87192918561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6079820.

The product of its digits is 2177280, while the sum is 57.

The spelling of 87192918561 in words is "eighty-seven billion, one hundred ninety-two million, nine hundred eighteen thousand, five hundred sixty-one".