66004325640 has 96 divisors (see below), whose sum is σ = 234015350400. Its totient is φ = 16001047680.

The previous prime is 66004325633. The next prime is 66004325687. The reversal of 66004325640 is 4652340066.

66004325640 is a `hidden beast` number, since 6 + 6 + 0 + 0 + 4 + 3 + 2 + 5 + 640 = 666.

It is a super-2 number, since 2×66004325640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66004325595 and 66004325604.

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, 8329920 + ... + 8337839.

It is an arithmetic number, because the mean of its divisors is an integer number (2437659900).

Almost surely, 2^66004325640 is an apocalyptic number.

66004325640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66004325640 is an abundant number, since it is smaller than the sum of its proper divisors (168011024760).

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

66004325640 is a wasteful number, since it uses less digits than its factorization.

66004325640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16667787 (or 16667780 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 66004325640 in words is "sixty-six billion, four million, three hundred twenty-five thousand, six hundred forty".