21623660165304 has 96 divisors (see below), whose sum is σ = 61313453182800. Its totient is φ = 6875491392000.

The previous prime is 21623660165293. The next prime is 21623660165323. The reversal of 21623660165304 is 40356106632612.

21623660165304 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 3 + 6 + 601 + 6 + 5 + 30 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21623660165304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62213197 + ... + 62559804.

Almost surely, 2^{21623660165304} is an apocalyptic number.

21623660165304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21623660165304 is an abundant number, since it is smaller than the sum of its proper divisors (39689793017496).

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

21623660165304 is a wasteful number, since it uses less digits than its factorization.

21623660165304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124773125 (or 124773118 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

Adding to 21623660165304 its reverse (40356106632612), we get a palindrome (61979766797916).

The spelling of 21623660165304 in words is "twenty-one trillion, six hundred twenty-three billion, six hundred sixty million, one hundred sixty-five thousand, three hundred four".