666634139580 has 24 divisors (see below), whose sum is σ = 1866575590992. Its totient is φ = 177769103872.

The previous prime is 666634139557. The next prime is 666634139581. The reversal of 666634139580 is 85931436666.

It is a self number, because there is not a number n which added to its sum of digits gives 666634139580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666634139581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555284437 + ... + 5555284556.

It is an arithmetic number, because the mean of its divisors is an integer number (77773982958).

Almost surely, 2^666634139580 is an apocalyptic number.

666634139580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666634139580 is an abundant number, since it is smaller than the sum of its proper divisors (1199941451412).

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

666634139580 is a wasteful number, since it uses less digits than its factorization.

666634139580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110569005 (or 11110569003 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 666634139580 in words is "six hundred sixty-six billion, six hundred thirty-four million, one hundred thirty-nine thousand, five hundred eighty".