646948440912 has 80 divisors (see below), whose sum is σ = 1753265105280. Its totient is φ = 205280678400.

The previous prime is 646948440871. The next prime is 646948440913. The reversal of 646948440912 is 219044849646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646948440913) 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, 3174139 + ... + 3371802.

It is an arithmetic number, because the mean of its divisors is an integer number (21915813816).

Almost surely, 2^646948440912 is an apocalyptic number.

It is an amenable number.

646948440912 is an abundant number, since it is smaller than the sum of its proper divisors (1106316664368).

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

646948440912 is a wasteful number, since it uses less digits than its factorization.

646948440912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546052 (or 6546046 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 57.

The spelling of 646948440912 in words is "six hundred forty-six billion, nine hundred forty-eight million, four hundred forty thousand, nine hundred twelve".