646705670825 has 24 divisors (see below), whose sum is σ = 813457131840. Its totient is φ = 509922459200.

The previous prime is 646705670801. The next prime is 646705670851. The reversal of 646705670825 is 528076507646.

It is not a de Polignac number, because 646705670825 - 2¹² = 646705666729 is a prime.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

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 23 ways as a sum of consecutive naturals, for example, 5961722 + ... + 6069228.

It is an arithmetic number, because the mean of its divisors is an integer number (33894047160).

Almost surely, 2^646705670825 is an apocalyptic number.

It is an amenable number.

646705670825 is a deficient number, since it is larger than the sum of its proper divisors (166751461015).

646705670825 is a wasteful number, since it uses less digits than its factorization.

646705670825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110977 (or 110972 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 646705670825 in words is "six hundred forty-six billion, seven hundred five million, six hundred seventy thousand, eight hundred twenty-five".