64660466650 has 48 divisors (see below), whose sum is σ = 131643246168. Its totient is φ = 23483232000.

The previous prime is 64660466639. The next prime is 64660466681. The reversal of 64660466650 is 5666406646.

64660466650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 13062889849 + 51597576801 = 114293^2 + 227151^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64660466594 and 64660466603.

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, 775741 + ... + 855040.

Almost surely, 2^64660466650 is an apocalyptic number.

64660466650 is an abundant number, since it is smaller than the sum of its proper divisors (66982779518).

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

64660466650 is a wasteful number, since it uses less digits than its factorization.

64660466650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630867 (or 1630862 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 64660466650 in words is "sixty-four billion, six hundred sixty million, four hundred sixty-six thousand, six hundred fifty".