646672612 has 6 divisors (see below), whose sum is σ = 1131677078. Its totient is φ = 323336304.

The previous prime is 646672603. The next prime is 646672667. The reversal of 646672612 is 216276646.

It can be written as a sum of positive squares in only one way, i.e., 559511716 + 87160896 = 23654^2 + 9336^2 .

It is a super-2 number, since 2×646672612² = 836370934221805088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80834073 + ... + 80834080.

Almost surely, 2^646672612 is an apocalyptic number.

It is an amenable number.

646672612 is a deficient number, since it is larger than the sum of its proper divisors (485004466).

646672612 is a wasteful number, since it uses less digits than its factorization.

646672612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161668157 (or 161668155 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 646672612 is about 25429.7583944480. The cubic root of 646672612 is about 864.7584664264.

The spelling of 646672612 in words is "six hundred forty-six million, six hundred seventy-two thousand, six hundred twelve".