666131250306420 has 144 divisors (see below), whose sum is σ = 2053230108908160. Its totient is φ = 174772650716928.

The previous prime is 666131250306407. The next prime is 666131250306427. The reversal of 666131250306420 is 24603052131666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666131250306427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23316352 + ... + 43311831.

Almost surely, 2^{666131250306420} is an apocalyptic number.

666131250306420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666131250306420 is an abundant number, since it is smaller than the sum of its proper divisors (1387098858601740).

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

666131250306420 is a wasteful number, since it uses less digits than its factorization.

666131250306420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66629094 (or 66629089 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 666131250306420 in words is "six hundred sixty-six trillion, one hundred thirty-one billion, two hundred fifty million, three hundred six thousand, four hundred twenty".