646253016 has 16 divisors (see below), whose sum is σ = 1615632600. Its totient is φ = 215417664.

The previous prime is 646252991. The next prime is 646253017. The reversal of 646253016 is 610352646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646253017) 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, 13463581 + ... + 13463628.

Almost surely, 2^646253016 is an apocalyptic number.

It is an amenable number.

646253016 is an abundant number, since it is smaller than the sum of its proper divisors (969379584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646253016 is a wasteful number, since it uses less digits than its factorization.

646253016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26927218 (or 26927214 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 646253016 is about 25421.5069576923. The cubic root of 646253016 is about 864.5713920121.

The spelling of 646253016 in words is "six hundred forty-six million, two hundred fifty-three thousand, sixteen".