666692888960 has 128 divisors (see below), whose sum is σ = 1823049296640. Its totient is φ = 228386027520.

The previous prime is 666692888957. The next prime is 666692888963. The reversal of 666692888960 is 69888296666.

666692888960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666692888957) and next prime (666692888963).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666692888963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5255075 + ... + 5380445.

It is an arithmetic number, because the mean of its divisors is an integer number (14242572630).

Almost surely, 2^666692888960 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 666692888960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911524648320).

666692888960 is an abundant number, since it is smaller than the sum of its proper divisors (1156356407680).

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

666692888960 is a wasteful number, since it uses less digits than its factorization.

666692888960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126584 (or 126572 counting only the distinct ones).

The product of its (nonzero) digits is 644972544, while the sum is 74.

The spelling of 666692888960 in words is "six hundred sixty-six billion, six hundred ninety-two million, eight hundred eighty-eight thousand, nine hundred sixty".