864266636872 has 8 divisors (see below), whose sum is σ = 1620499944150. Its totient is φ = 432133318432.

The previous prime is 864266636837. The next prime is 864266636887. The reversal of 864266636872 is 278636662468.

It can be written as a sum of positive squares in only one way, i.e., 844623493156 + 19643143716 = 919034^2 + 140154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×864266636872² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54016664797 + ... + 54016664812.

Almost surely, 2^864266636872 is an apocalyptic number.

It is an amenable number.

864266636872 is a deficient number, since it is larger than the sum of its proper divisors (756233307278).

864266636872 is a wasteful number, since it uses less digits than its factorization.

864266636872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108033329615 (or 108033329611 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 64.

The spelling of 864266636872 in words is "eight hundred sixty-four billion, two hundred sixty-six million, six hundred thirty-six thousand, eight hundred seventy-two".