641516756 has 12 divisors (see below), whose sum is σ = 1123637760. Its totient is φ = 320477400.

The previous prime is 641516749. The next prime is 641516783. The reversal of 641516756 is 657615146.

It is a congruent number.

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, 65066 + ... + 74273.

It is an arithmetic number, because the mean of its divisors is an integer number (93636480).

Almost surely, 2^641516756 is an apocalyptic number.

It is an amenable number.

641516756 is a deficient number, since it is larger than the sum of its proper divisors (482121004).

641516756 is a wasteful number, since it uses less digits than its factorization.

641516756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140494 (or 140492 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 641516756 is about 25328.1810637874. The cubic root of 641516756 is about 862.4541205309.

It can be divided in two parts, 64151 and 6756, that added together give a palindrome (70907).

The spelling of 641516756 in words is "six hundred forty-one million, five hundred sixteen thousand, seven hundred fifty-six".