646858515513 has 64 divisors (see below), whose sum is σ = 1062454722560. Its totient is φ = 341791265088.

The previous prime is 646858515473. The next prime is 646858515517. The reversal of 646858515513 is 315515858646.

646858515513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646858515513 - 2¹⁴ = 646858499129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (646858515517) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25431120 + ... + 25456542.

It is an arithmetic number, because the mean of its divisors is an integer number (16600855040).

Almost surely, 2^646858515513 is an apocalyptic number.

It is an amenable number.

646858515513 is a deficient number, since it is larger than the sum of its proper divisors (415596207047).

646858515513 is a wasteful number, since it uses less digits than its factorization.

646858515513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26978.

The product of its digits is 17280000, while the sum is 57.

The spelling of 646858515513 in words is "six hundred forty-six billion, eight hundred fifty-eight million, five hundred fifteen thousand, five hundred thirteen".