646400724399 has 24 divisors (see below), whose sum is σ = 951423054192. Its totient is φ = 422751288960.

The previous prime is 646400724397. The next prime is 646400724419. The reversal of 646400724399 is 993427004646.

646400724399 is a `hidden beast` number, since 6 + 46 + 400 + 72 + 43 + 99 = 666.

646400724399 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646400724399 - 2¹ = 646400724397 is a prime.

It is a super-2 number, since 2×646400724399² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646400724397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4036539 + ... + 4193619.

It is an arithmetic number, because the mean of its divisors is an integer number (39642627258).

Almost surely, 2^646400724399 is an apocalyptic number.

646400724399 is a deficient number, since it is larger than the sum of its proper divisors (305022329793).

646400724399 is a wasteful number, since it uses less digits than its factorization.

646400724399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165767 (or 165764 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 646400724399 in words is "six hundred forty-six billion, four hundred million, seven hundred twenty-four thousand, three hundred ninety-nine".