66635802624 has 96 divisors (see below), whose sum is σ = 178184784960. Its totient is φ = 22145335296.

The previous prime is 66635802553. The next prime is 66635802631. The reversal of 66635802624 is 42620853666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 2054437 + ... + 2086619.

It is an arithmetic number, because the mean of its divisors is an integer number (1856091510).

Almost surely, 2^66635802624 is an apocalyptic number.

66635802624 is a gapful number since it is divisible by the number (64) 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 66635802624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89092392480).

66635802624 is an abundant number, since it is smaller than the sum of its proper divisors (111548982336).

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

66635802624 is a wasteful number, since it uses less digits than its factorization.

66635802624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32545 (or 32525 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 66635802624 in words is "sixty-six billion, six hundred thirty-five million, eight hundred two thousand, six hundred twenty-four".