66401057600 has 84 divisors (see below), whose sum is σ = 168658812288. Its totient is φ = 25703616000.

The previous prime is 66401057599. The next prime is 66401057609. The reversal of 66401057600 is 675010466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401057609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619766 + ... + 718965.

Almost surely, 2^66401057600 is an apocalyptic number.

It is an amenable number.

66401057600 is an abundant number, since it is smaller than the sum of its proper divisors (102257754688).

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

66401057600 is a wasteful number, since it uses less digits than its factorization.

66401057600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338784 (or 1338769 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 66401057600 in words is "sixty-six billion, four hundred one million, fifty-seven thousand, six hundred".