21665165062 has 8 divisors (see below), whose sum is σ = 32570127000. Its totient is φ = 10808456064.

The previous prime is 21665164981. The next prime is 21665165063. The reversal of 21665165062 is 26056156612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21665165063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12062112 + ... + 12063907.

It is an arithmetic number, because the mean of its divisors is an integer number (4071265875).

Almost surely, 2^21665165062 is an apocalyptic number.

21665165062 is a deficient number, since it is larger than the sum of its proper divisors (10904961938).

21665165062 is a wasteful number, since it uses less digits than its factorization.

21665165062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24126470.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21665165062 in words is "twenty-one billion, six hundred sixty-five million, one hundred sixty-five thousand, sixty-two".