642756475756 has 6 divisors (see below), whose sum is σ = 1124823832580. Its totient is φ = 321378237876.

The previous prime is 642756475741. The next prime is 642756475763. The reversal of 642756475756 is 657574657246.

It is a super-3 number, since 3×642756475756³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80344559466 + ... + 80344559473.

Almost surely, 2^642756475756 is an apocalyptic number.

It is an amenable number.

642756475756 is a deficient number, since it is larger than the sum of its proper divisors (482067356824).

642756475756 is a wasteful number, since it uses less digits than its factorization.

642756475756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160689118943 (or 160689118941 counting only the distinct ones).

The product of its digits is 296352000, while the sum is 64.

The spelling of 642756475756 in words is "six hundred forty-two billion, seven hundred fifty-six million, four hundred seventy-five thousand, seven hundred fifty-six".