641515016 has 16 divisors (see below), whose sum is σ = 1209075900. Its totient is φ = 319094784.

The previous prime is 641515013. The next prime is 641515037. The reversal of 641515016 is 610515146.

It can be written as a sum of positive squares in 2 ways, for example, as 627302116 + 14212900 = 25046^2 + 3770^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 641515016.

It is not an unprimeable number, because it can be changed into a prime (641515013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206201 + ... + 209288.

Almost surely, 2^641515016 is an apocalyptic number.

It is an amenable number.

641515016 is a deficient number, since it is larger than the sum of its proper divisors (567560884).

641515016 is a wasteful number, since it uses less digits than its factorization.

641515016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415688 (or 415684 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 641515016 is about 25328.1467146730. The cubic root of 641515016 is about 862.4533407791.

The spelling of 641515016 in words is "six hundred forty-one million, five hundred fifteen thousand, sixteen".