87156120221568 has 96 divisors (see below), whose sum is σ = 251315807723760. Its totient is φ = 28992384774144.

The previous prime is 87156120221567. The next prime is 87156120221603. The reversal of 87156120221568 is 86512202165178.

87156120221568 is a `hidden beast` number, since 8 + 7 + 1 + 5 + 612 + 0 + 2 + 2 + 15 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87156120221567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77114905 + ... + 78236952.

Almost surely, 2^{87156120221568} is an apocalyptic number.

It is an amenable number.

87156120221568 is an abundant number, since it is smaller than the sum of its proper divisors (164159687502192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87156120221568 is a wasteful number, since it uses less digits than its factorization.

87156120221568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155352364 (or 155352349 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 87156120221568 in words is "eighty-seven trillion, one hundred fifty-six billion, one hundred twenty million, two hundred twenty-one thousand, five hundred sixty-eight".