66764583936 has 352 divisors, whose sum is σ = 207610997760. Its totient is φ = 21167308800.

The previous prime is 66764583923. The next prime is 66764583953. The reversal of 66764583936 is 63938546766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52281730 + ... + 52283006.

Almost surely, 2^66764583936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66764583936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103805498880).

66764583936 is an abundant number, since it is smaller than the sum of its proper divisors (140846413824).

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

66764583936 is a wasteful number, since it uses less digits than its factorization.

66764583936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398 (or 1374 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 63.

The spelling of 66764583936 in words is "sixty-six billion, seven hundred sixty-four million, five hundred eighty-three thousand, nine hundred thirty-six".