21759657695 has 16 divisors (see below), whose sum is σ = 26527288320. Its totient is φ = 17132013600.

The previous prime is 21759657653. The next prime is 21759657757. The reversal of 21759657695 is 59675695712.

It is a de Polignac number, because none of the positive numbers 2^k-21759657695 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34280 + ... + 211410.

It is an arithmetic number, because the mean of its divisors is an integer number (1657955520).

Almost surely, 2^21759657695 is an apocalyptic number.

21759657695 is a deficient number, since it is larger than the sum of its proper divisors (4767630625).

21759657695 is a wasteful number, since it uses less digits than its factorization.

21759657695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177526.

The product of its digits is 35721000, while the sum is 62.

The spelling of 21759657695 in words is "twenty-one billion, seven hundred fifty-nine million, six hundred fifty-seven thousand, six hundred ninety-five".