667977250161 has 32 divisors (see below), whose sum is σ = 992292940800. Its totient is φ = 396916531200.

The previous prime is 667977250147. The next prime is 667977250169. The reversal of 667977250161 is 161052779766.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-667977250161 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667977250169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72420 + ... + 1158101.

It is an arithmetic number, because the mean of its divisors is an integer number (31009154400).

Almost surely, 2^667977250161 is an apocalyptic number.

It is an amenable number.

667977250161 is a deficient number, since it is larger than the sum of its proper divisors (324315690639).

667977250161 is a wasteful number, since it uses less digits than its factorization.

667977250161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231017.

The product of its (nonzero) digits is 6667920, while the sum is 57.

The spelling of 667977250161 in words is "six hundred sixty-seven billion, nine hundred seventy-seven million, two hundred fifty thousand, one hundred sixty-one".