667165621220 has 24 divisors (see below), whose sum is σ = 1601197491264. Its totient is φ = 228742498656.

The previous prime is 667165621211. The next prime is 667165621237. The reversal of 667165621220 is 22126561766.

It is a super-2 number, since 2×667165621220² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2382734222 + ... + 2382734501.

It is an arithmetic number, because the mean of its divisors is an integer number (66716562136).

Almost surely, 2^667165621220 is an apocalyptic number.

It is an amenable number.

667165621220 is an abundant number, since it is smaller than the sum of its proper divisors (934031870044).

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

667165621220 is a wasteful number, since it uses less digits than its factorization.

667165621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765468739 (or 4765468737 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 667165621220 in words is "six hundred sixty-seven billion, one hundred sixty-five million, six hundred twenty-one thousand, two hundred twenty".