66377425920 has 704 divisors, whose sum is σ = 242653017600. Its totient is φ = 15363735552.

The previous prime is 66377425901. The next prime is 66377425949. The reversal of 66377425920 is 2952477366.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 445486006 + ... + 445486154.

Almost surely, 2^66377425920 is an apocalyptic number.

66377425920 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 66377425920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121326508800).

66377425920 is an abundant number, since it is smaller than the sum of its proper divisors (176275591680).

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

66377425920 is a wasteful number, since it uses less digits than its factorization.

66377425920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 66377425920 in words is "sixty-six billion, three hundred seventy-seven million, four hundred twenty-five thousand, nine hundred twenty".