664121156 has 12 divisors (see below), whose sum is σ = 1162483392. Its totient is φ = 331983048.

The previous prime is 664121119. The next prime is 664121173. The reversal of 664121156 is 651121466.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2681 + ... + 36543.

It is an arithmetic number, because the mean of its divisors is an integer number (96873616).

Almost surely, 2^664121156 is an apocalyptic number.

It is an amenable number.

664121156 is a deficient number, since it is larger than the sum of its proper divisors (498362236).

664121156 is a wasteful number, since it uses less digits than its factorization.

664121156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38770 (or 38768 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 664121156 is about 25770.5482285496. The cubic root of 664121156 is about 872.4671924129.

The spelling of 664121156 in words is "six hundred sixty-four million, one hundred twenty-one thousand, one hundred fifty-six".