667745200620 has 72 divisors (see below), whose sum is σ = 2045548224720. Its totient is φ = 176302358400.

The previous prime is 667745200601. The next prime is 667745200627. The reversal of 667745200620 is 26002547766.

667745200620 is a `hidden beast` number, since 6 + 67 + 7 + 4 + 520 + 0 + 62 + 0 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (667745200627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18346650 + ... + 18383009.

It is an arithmetic number, because the mean of its divisors is an integer number (28410392010).

Almost surely, 2^667745200620 is an apocalyptic number.

667745200620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667745200620 is an abundant number, since it is smaller than the sum of its proper divisors (1377803024100).

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

667745200620 is a wasteful number, since it uses less digits than its factorization.

667745200620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36729775 (or 36729770 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 667745200620 in words is "six hundred sixty-seven billion, seven hundred forty-five million, two hundred thousand, six hundred twenty".