646884139013 has 16 divisors (see below), whose sum is σ = 746434376064. Its totient is φ = 549121636800.

The previous prime is 646884139003. The next prime is 646884139049. The reversal of 646884139013 is 310931488646.

It is a cyclic number.

It is not a de Polignac number, because 646884139013 - 2⁴ = 646884138997 is a prime.

It is a super-2 number, since 2×646884139013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646884139003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2341631 + ... + 2603267.

It is an arithmetic number, because the mean of its divisors is an integer number (46652148504).

Almost surely, 2^646884139013 is an apocalyptic number.

It is an amenable number.

646884139013 is a deficient number, since it is larger than the sum of its proper divisors (99550237051).

646884139013 is a wasteful number, since it uses less digits than its factorization.

646884139013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265052.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 646884139013 in words is "six hundred forty-six billion, eight hundred eighty-four million, one hundred thirty-nine thousand, thirteen".