66397891092 has 24 divisors (see below), whose sum is σ = 166845983136. Its totient is φ = 20430120288.

The previous prime is 66397891039. The next prime is 66397891103. The reversal of 66397891092 is 29019879366.

It is a congruent number.

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, 212813598 + ... + 212813909.

It is an arithmetic number, because the mean of its divisors is an integer number (6951915964).

Almost surely, 2^66397891092 is an apocalyptic number.

It is an amenable number.

66397891092 is an abundant number, since it is smaller than the sum of its proper divisors (100448092044).

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

66397891092 is a wasteful number, since it uses less digits than its factorization.

66397891092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425627527 (or 425627525 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 60.

The spelling of 66397891092 in words is "sixty-six billion, three hundred ninety-seven million, eight hundred ninety-one thousand, ninety-two".