26701640644 has 12 divisors (see below), whose sum is σ = 53403281344. Its totient is φ = 11443560264.

The previous prime is 26701640639. The next prime is 26701640659. The reversal of 26701640644 is 44604610762.

26701640644 is an admirable number.

It is a super-2 number, since 2×26701640644² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 26701640597 and 26701640606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476814984 + ... + 476815039.

Almost surely, 2^26701640644 is an apocalyptic number.

It is an amenable number.

26701640644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

26701640644 is a wasteful number, since it uses less digits than its factorization.

26701640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953630034 (or 953630032 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 26701640644 in words is "twenty-six billion, seven hundred one million, six hundred forty thousand, six hundred forty-four".