66064040040 has 32 divisors (see below), whose sum is σ = 198192120480. Its totient is φ = 17617077312.

The previous prime is 66064040039. The next prime is 66064040059. The reversal of 66064040040 is 4004046066.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275266714 + ... + 275266953.

It is an arithmetic number, because the mean of its divisors is an integer number (6193503765).

Almost surely, 2^66064040040 is an apocalyptic number.

66064040040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66064040040 is an abundant number, since it is smaller than the sum of its proper divisors (132128080440).

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

66064040040 is a wasteful number, since it uses less digits than its factorization.

66064040040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550533681 (or 550533677 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 66064040040 in words is "sixty-six billion, sixty-four million, forty thousand, forty", and thus it is an eban number.