665357625780 has 48 divisors (see below), whose sum is σ = 1863307139904. Its totient is φ = 177399577600.

The previous prime is 665357625707. The next prime is 665357625817. The reversal of 665357625780 is 87526753566.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540246 + ... + 1273805.

It is an arithmetic number, because the mean of its divisors is an integer number (38818898748).

Almost surely, 2^665357625780 is an apocalyptic number.

665357625780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665357625780 is an abundant number, since it is smaller than the sum of its proper divisors (1197949514124).

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

665357625780 is a wasteful number, since it uses less digits than its factorization.

665357625780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820176 (or 1820174 counting only the distinct ones).

The product of its (nonzero) digits is 63504000, while the sum is 60.

The spelling of 665357625780 in words is "six hundred sixty-five billion, three hundred fifty-seven million, six hundred twenty-five thousand, seven hundred eighty".