646955344854 has 96 divisors (see below), whose sum is σ = 1725603856704. Its totient is φ = 170587054080.

The previous prime is 646955344817. The next prime is 646955344879. The reversal of 646955344854 is 458443559646.

It is a happy number.

646955344854 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 5 + 534 + 48 + 54 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 646955344791 and 646955344800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7612114 + ... + 7696634.

It is an arithmetic number, because the mean of its divisors is an integer number (17975040174).

Almost surely, 2^646955344854 is an apocalyptic number.

646955344854 is an abundant number, since it is smaller than the sum of its proper divisors (1078648511850).

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

646955344854 is a wasteful number, since it uses less digits than its factorization.

646955344854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89222 (or 89219 counting only the distinct ones).

The product of its digits is 248832000, while the sum is 63.

The spelling of 646955344854 in words is "six hundred forty-six billion, nine hundred fifty-five million, three hundred forty-four thousand, eight hundred fifty-four".