86819961556 has 6 divisors (see below), whose sum is σ = 151934932730. Its totient is φ = 43409980776.

The previous prime is 86819961541. The next prime is 86819961577. The reversal of 86819961556 is 65516991868.

It can be written as a sum of positive squares in only one way, i.e., 86700802500 + 119159056 = 294450^2 + 10916^2 .

It is a super-2 number, since 2×86819961556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10852495191 + ... + 10852495198.

Almost surely, 2^86819961556 is an apocalyptic number.

It is an amenable number.

86819961556 is a deficient number, since it is larger than the sum of its proper divisors (65114971174).

86819961556 is a wasteful number, since it uses less digits than its factorization.

86819961556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21704990393 (or 21704990391 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 64.

The spelling of 86819961556 in words is "eighty-six billion, eight hundred nineteen million, nine hundred sixty-one thousand, five hundred fifty-six".