87166645652 has 6 divisors (see below), whose sum is σ = 152541629898. Its totient is φ = 43583322824.

The previous prime is 87166645613. The next prime is 87166645681. The reversal of 87166645652 is 25654666178.

It can be written as a sum of positive squares in only one way, i.e., 86710225156 + 456420496 = 294466^2 + 21364^2 .

It is a super-2 number, since 2×87166645652² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10895830703 + ... + 10895830710.

It is an arithmetic number, because the mean of its divisors is an integer number (25423604983).

Almost surely, 2^87166645652 is an apocalyptic number.

It is an amenable number.

87166645652 is a deficient number, since it is larger than the sum of its proper divisors (65374984246).

87166645652 is a wasteful number, since it uses less digits than its factorization.

87166645652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21791661417 (or 21791661415 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 87166645652 in words is "eighty-seven billion, one hundred sixty-six million, six hundred forty-five thousand, six hundred fifty-two".