66307606650 has 72 divisors (see below), whose sum is σ = 188625660444. Its totient is φ = 16641907200.

The previous prime is 66307606619. The next prime is 66307606661. The reversal of 66307606650 is 5660670366.

It is a happy number.

66307606650 is a `hidden beast` number, since 6 + 6 + 30 + 7 + 606 + 6 + 5 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 41384985489 + 24922621161 = 203433^2 + 157869^2 .

It is a super-2 number, since 2×66307606650² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 66307606596 and 66307606605.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4326181 + ... + 4341480.

Almost surely, 2^66307606650 is an apocalyptic number.

66307606650 is an abundant number, since it is smaller than the sum of its proper divisors (122318053794).

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

66307606650 is a wasteful number, since it uses less digits than its factorization.

66307606650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8667696 (or 8667688 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The spelling of 66307606650 in words is "sixty-six billion, three hundred seven million, six hundred six thousand, six hundred fifty".