646211156 has 6 divisors (see below), whose sum is σ = 1130869530. Its totient is φ = 323105576.

The previous prime is 646211149. The next prime is 646211161. The reversal of 646211156 is 651112646.

It can be written as a sum of positive squares in only one way, i.e., 487703056 + 158508100 = 22084^2 + 12590^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80776391 + ... + 80776398.

It is an arithmetic number, because the mean of its divisors is an integer number (188478255).

Almost surely, 2^646211156 is an apocalyptic number.

It is an amenable number.

646211156 is a deficient number, since it is larger than the sum of its proper divisors (484658374).

646211156 is a wasteful number, since it uses less digits than its factorization.

646211156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161552793 (or 161552791 counting only the distinct ones).

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

The square root of 646211156 is about 25420.6836257407. The cubic root of 646211156 is about 864.5527245351.

The spelling of 646211156 in words is "six hundred forty-six million, two hundred eleven thousand, one hundred fifty-six".