646885996692 has 288 divisors, whose sum is σ = 1729580211072. Its totient is φ = 186952955904.

The previous prime is 646885996663. The next prime is 646885996693. The reversal of 646885996692 is 296699588646.

646885996692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×646885996692² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646885996693) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 758365338 + ... + 758366190.

It is an arithmetic number, because the mean of its divisors is an integer number (6005486844).

Almost surely, 2^646885996692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646885996692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864790105536).

646885996692 is an abundant number, since it is smaller than the sum of its proper divisors (1082694214380).

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

646885996692 is a wasteful number, since it uses less digits than its factorization.

646885996692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1028 counting only the distinct ones).

The product of its digits is 2418647040, while the sum is 78.

The spelling of 646885996692 in words is "six hundred forty-six billion, eight hundred eighty-five million, nine hundred ninety-six thousand, six hundred ninety-two".