646554455646 has 32 divisors (see below), whose sum is σ = 1493644520448. Its totient is φ = 184400557440.

The previous prime is 646554455551. The next prime is 646554455683.

646554455646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646554455646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288124750 + ... + 288126993.

It is an arithmetic number, because the mean of its divisors is an integer number (46676391264).

Almost surely, 2^646554455646 is an apocalyptic number.

646554455646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646554455646 is an abundant number, since it is smaller than the sum of its proper divisors (847090064802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646554455646 is a wasteful number, since it uses less digits than its factorization.

646554455646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576251776.

The product of its digits is 207360000, while the sum is 60.

The spelling of 646554455646 in words is "six hundred forty-six billion, five hundred fifty-four million, four hundred fifty-five thousand, six hundred forty-six".