666732157020 has 72 divisors (see below), whose sum is σ = 2040975256320. Its totient is φ = 176164087680.

The previous prime is 666732157001. The next prime is 666732157027. The reversal of 666732157020 is 20751237666.

666732157020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (666732157027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16971516 + ... + 17010755.

It is an arithmetic number, because the mean of its divisors is an integer number (28346878560).

Almost surely, 2^666732157020 is an apocalyptic number.

666732157020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666732157020 is an abundant number, since it is smaller than the sum of its proper divisors (1374243099300).

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

666732157020 is a wasteful number, since it uses less digits than its factorization.

666732157020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33982395 (or 33982390 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 666732157020 in words is "six hundred sixty-six billion, seven hundred thirty-two million, one hundred fifty-seven thousand, twenty".