646259497984 has 88 divisors (see below), whose sum is σ = 1301492065328. Its totient is φ = 320734494720.

The previous prime is 646259497963. The next prime is 646259497997. The reversal of 646259497984 is 489794952646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106940467 + ... + 106946509.

Almost surely, 2^646259497984 is an apocalyptic number.

646259497984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646259497984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (650746032664).

646259497984 is an abundant number, since it is smaller than the sum of its proper divisors (655232567344).

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

646259497984 is a wasteful number, since it uses less digits than its factorization.

646259497984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6821 (or 6803 counting only the distinct ones).

The product of its digits is 940584960, while the sum is 73.

The spelling of 646259497984 in words is "six hundred forty-six billion, two hundred fifty-nine million, four hundred ninety-seven thousand, nine hundred eighty-four".