66934553640 has 64 divisors (see below), whose sum is σ = 204207134400. Its totient is φ = 17546683392.

The previous prime is 66934553591. The next prime is 66934553723. The reversal of 66934553640 is 4635543966.

66934553640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4719937 + ... + 4734096.

It is an arithmetic number, because the mean of its divisors is an integer number (3190736475).

Almost surely, 2^66934553640 is an apocalyptic number.

66934553640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66934553640 is an abundant number, since it is smaller than the sum of its proper divisors (137272580760).

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

66934553640 is a wasteful number, since it uses less digits than its factorization.

66934553640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9454106 (or 9454102 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 51.

The spelling of 66934553640 in words is "sixty-six billion, nine hundred thirty-four million, five hundred fifty-three thousand, six hundred forty".