66929460640 has 72 divisors (see below), whose sum is σ = 183936521412. Its totient is φ = 22947240960.

The previous prime is 66929460593. The next prime is 66929460643. The reversal of 66929460640 is 4606492966.

It can be written as a sum of positive squares in 2 ways, for example, as 60203492496 + 6725968144 = 245364^2 + 82012^2 .

It is a super-2 number, since 2×66929460640² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66929460643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4260621 + ... + 4276300.

Almost surely, 2^66929460640 is an apocalyptic number.

It is an amenable number.

66929460640 is an abundant number, since it is smaller than the sum of its proper divisors (117007060772).

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

66929460640 is a wasteful number, since it uses less digits than its factorization.

66929460640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8536950 (or 8536935 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 52.

The spelling of 66929460640 in words is "sixty-six billion, nine hundred twenty-nine million, four hundred sixty thousand, six hundred forty".