66765942600 has 96 divisors (see below), whose sum is σ = 236542211520. Its totient is φ = 15260785920.

The previous prime is 66765942583. The next prime is 66765942643. The reversal of 66765942600 is 624956766.

It is a happy number.

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, 7944127 + ... + 7952526.

It is an arithmetic number, because the mean of its divisors is an integer number (2463981370).

Almost surely, 2^66765942600 is an apocalyptic number.

66765942600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66765942600 is an abundant number, since it is smaller than the sum of its proper divisors (169776268920).

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

66765942600 is a wasteful number, since it uses less digits than its factorization.

66765942600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15896679 (or 15896670 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 66765942600 in words is "sixty-six billion, seven hundred sixty-five million, nine hundred forty-two thousand, six hundred".