66696890832 has 320 divisors, whose sum is σ = 225843045120. Its totient is φ = 18579456000.

The previous prime is 66696890809. The next prime is 66696890849. The reversal of 66696890832 is 23809869666.

It is a self number, because there is not a number n which added to its sum of digits gives 66696890832.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15874332 + ... + 15878532.

It is an arithmetic number, because the mean of its divisors is an integer number (705759516).

Almost surely, 2^66696890832 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 66696890832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112921522560).

66696890832 is an abundant number, since it is smaller than the sum of its proper divisors (159146154288).

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

66696890832 is a wasteful number, since it uses less digits than its factorization.

66696890832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499 (or 4487 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 63.

The spelling of 66696890832 in words is "sixty-six billion, six hundred ninety-six million, eight hundred ninety thousand, eight hundred thirty-two".