646839460289 has 32 divisors (see below), whose sum is σ = 751523743872. Its totient is φ = 550211200000.

The previous prime is 646839460279. The next prime is 646839460327. The reversal of 646839460289 is 982064938646.

It is a de Polignac number, because none of the positive numbers 2^k-646839460289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646839460279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53447339 + ... + 53459439.

It is an arithmetic number, because the mean of its divisors is an integer number (23485116996).

Almost surely, 2^646839460289 is an apocalyptic number.

It is an amenable number.

646839460289 is a deficient number, since it is larger than the sum of its proper divisors (104684283583).

646839460289 is a wasteful number, since it uses less digits than its factorization.

646839460289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13777.

The product of its (nonzero) digits is 107495424, while the sum is 65.

The spelling of 646839460289 in words is "six hundred forty-six billion, eight hundred thirty-nine million, four hundred sixty thousand, two hundred eighty-nine".