641056916 has 6 divisors (see below), whose sum is σ = 1121849610. Its totient is φ = 320528456.

The previous prime is 641056909. The next prime is 641056937. The reversal of 641056916 is 619650146.

It can be written as a sum of positive squares in only one way, i.e., 501580816 + 139476100 = 22396^2 + 11810^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 641056916.

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, 80132111 + ... + 80132118.

It is an arithmetic number, because the mean of its divisors is an integer number (186974935).

Almost surely, 2^641056916 is an apocalyptic number.

It is an amenable number.

641056916 is a deficient number, since it is larger than the sum of its proper divisors (480792694).

641056916 is a wasteful number, since it uses less digits than its factorization.

641056916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160264233 (or 160264231 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 641056916 is about 25319.1018008143. The cubic root of 641056916 is about 862.2480018828.

The spelling of 641056916 in words is "six hundred forty-one million, fifty-six thousand, nine hundred sixteen".