646546653399 has 4 divisors (see below), whose sum is σ = 862062204536. Its totient is φ = 431031102264.

The previous prime is 646546653373. The next prime is 646546653407. The reversal of 646546653399 is 993356645646.

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

It is not a de Polignac number, because 646546653399 - 2⁹ = 646546652887 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 (646546653349) 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, 107757775564 + ... + 107757775569.

It is an arithmetic number, because the mean of its divisors is an integer number (215515551134).

Almost surely, 2^646546653399 is an apocalyptic number.

646546653399 is a deficient number, since it is larger than the sum of its proper divisors (215515551137).

646546653399 is a wasteful number, since it uses less digits than its factorization.

646546653399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215515551136.

The product of its digits is 377913600, while the sum is 66.

The spelling of 646546653399 in words is "six hundred forty-six billion, five hundred forty-six million, six hundred fifty-three thousand, three hundred ninety-nine".