664207652650 has 48 divisors (see below), whose sum is σ = 1271983509720. Its totient is φ = 257887078400.

The previous prime is 664207652629. The next prime is 664207652653. The reversal of 664207652650 is 56256702466.

It can be written as a sum of positive squares in 12 ways, for example, as 1564439809 + 662643212841 = 39553^2 + 814029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664207652594 and 664207652603.

It is not an unprimeable number, because it can be changed into a prime (664207652653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418495 + ... + 1226194.

Almost surely, 2^664207652650 is an apocalyptic number.

664207652650 is a deficient number, since it is larger than the sum of its proper divisors (607775857070).

664207652650 is a wasteful number, since it uses less digits than its factorization.

664207652650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644939 (or 1644934 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 664207652650 in words is "six hundred sixty-four billion, two hundred seven million, six hundred fifty-two thousand, six hundred fifty".