21716650065 has 32 divisors (see below), whose sum is σ = 37915776000. Its totient is φ = 10526409920.

The previous prime is 21716650049. The next prime is 21716650073. The reversal of 21716650065 is 56005661712.

It is not a de Polignac number, because 21716650065 - 2⁴ = 21716650049 is a prime.

It is a super-2 number, since 2×21716650065² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 667036 + ... + 698834.

It is an arithmetic number, because the mean of its divisors is an integer number (1184868000).

Almost surely, 2^21716650065 is an apocalyptic number.

It is an amenable number.

21716650065 is a deficient number, since it is larger than the sum of its proper divisors (16199125935).

21716650065 is a wasteful number, since it uses less digits than its factorization.

21716650065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35957.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 21716650065 in words is "twenty-one billion, seven hundred sixteen million, six hundred fifty thousand, sixty-five".