646884800407 has 4 divisors (see below), whose sum is σ = 656539797496. Its totient is φ = 637229803320.

The previous prime is 646884800347. The next prime is 646884800453. The reversal of 646884800407 is 704008488646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646884800407 - 2⁷ = 646884800279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646882800407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4827498444 + ... + 4827498577.

It is an arithmetic number, because the mean of its divisors is an integer number (164134949374).

Almost surely, 2^646884800407 is an apocalyptic number.

646884800407 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

646884800407 is a deficient number, since it is larger than the sum of its proper divisors (9654997089).

646884800407 is an equidigital number, since it uses as much as digits as its factorization.

646884800407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9654997088.

The product of its (nonzero) digits is 8257536, while the sum is 55.

The spelling of 646884800407 in words is "six hundred forty-six billion, eight hundred eighty-four million, eight hundred thousand, four hundred seven".