20651675660664 has 64 divisors (see below), whose sum is σ = 53927973987840. Its totient is φ = 6577987658880.

The previous prime is 20651675660663. The next prime is 20651675660677. The reversal of 20651675660664 is 46606657615602.

It is a junction number, because it is equal to n+sod(n) for n = 20651675660598 and 20651675660607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651675660663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18212172 + ... + 19312859.

It is an arithmetic number, because the mean of its divisors is an integer number (842624593560).

Almost surely, 2^{20651675660664} is an apocalyptic number.

20651675660664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20651675660664 is an abundant number, since it is smaller than the sum of its proper divisors (33276298327176).

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

20651675660664 is a wasteful number, since it uses less digits than its factorization.

20651675660664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37526060 (or 37526056 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 60.

The spelling of 20651675660664 in words is "twenty trillion, six hundred fifty-one billion, six hundred seventy-five million, six hundred sixty thousand, six hundred sixty-four".