666631305120 has 192 divisors, whose sum is σ = 2329615572480. Its totient is φ = 158868403200.

The previous prime is 666631305089. The next prime is 666631305121. The reversal of 666631305120 is 21503136666.

It is a happy number.

666631305120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666631305121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 758446 + ... + 1381485.

It is an arithmetic number, because the mean of its divisors is an integer number (12133414440).

Almost surely, 2^666631305120 is an apocalyptic number.

666631305120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666631305120 is an abundant number, since it is smaller than the sum of its proper divisors (1662984267360).

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

666631305120 is a wasteful number, since it uses less digits than its factorization.

666631305120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140019 (or 2140011 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 666631305120 in words is "six hundred sixty-six billion, six hundred thirty-one million, three hundred five thousand, one hundred twenty".