66990995136 has 112 divisors (see below), whose sum is σ = 212090508000. Its totient is φ = 20612606976.

The previous prime is 66990995129. The next prime is 66990995167. The reversal of 66990995136 is 63159909966.

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, 1468611 + ... + 1513538.

It is an arithmetic number, because the mean of its divisors is an integer number (1893665250).

Almost surely, 2^66990995136 is an apocalyptic number.

It is an amenable number.

66990995136 is an abundant number, since it is smaller than the sum of its proper divisors (145099512864).

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

66990995136 is a wasteful number, since it uses less digits than its factorization.

66990995136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982183 (or 2982167 counting only the distinct ones).

The product of its (nonzero) digits is 21257640, while the sum is 63.

The spelling of 66990995136 in words is "sixty-six billion, nine hundred ninety million, nine hundred ninety-five thousand, one hundred thirty-six".