66762865920 has 144 divisors (see below), whose sum is σ = 213335321472. Its totient is φ = 17794129920.

The previous prime is 66762865891. The next prime is 66762865933. The reversal of 66762865920 is 2956826766.

It is a congruent number.

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, 10522269 + ... + 10528611.

It is an arithmetic number, because the mean of its divisors is an integer number (1481495288).

Almost surely, 2^66762865920 is an apocalyptic number.

66762865920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66762865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106667660736).

66762865920 is an abundant number, since it is smaller than the sum of its proper divisors (146572455552).

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

66762865920 is a wasteful number, since it uses less digits than its factorization.

66762865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9108 (or 9094 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 66762865920 in words is "sixty-six billion, seven hundred sixty-two million, eight hundred sixty-five thousand, nine hundred twenty".