66199740900 has 72 divisors (see below), whose sum is σ = 191574196800. Its totient is φ = 17649920640.

The previous prime is 66199740877. The next prime is 66199740911. The reversal of 66199740900 is 904799166.

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, 1841902 + ... + 1877498.

Almost surely, 2^66199740900 is an apocalyptic number.

66199740900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66199740900 is an abundant number, since it is smaller than the sum of its proper divisors (125374455900).

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

66199740900 is a wasteful number, since it uses less digits than its factorization.

66199740900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41813 (or 41806 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The spelling of 66199740900 in words is "sixty-six billion, one hundred ninety-nine million, seven hundred forty thousand, nine hundred".