643770774474 has 16 divisors (see below), whose sum is σ = 1306758587808. Its totient is φ = 211387418352.

The previous prime is 643770774463. The next prime is 643770774527. The reversal of 643770774474 is 474477077346.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800709517 + ... + 800710320.

It is an arithmetic number, because the mean of its divisors is an integer number (81672411738).

Almost surely, 2^643770774474 is an apocalyptic number.

643770774474 is an abundant number, since it is smaller than the sum of its proper divisors (662987813334).

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

643770774474 is a wasteful number, since it uses less digits than its factorization.

643770774474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601419909.

The product of its (nonzero) digits is 77446656, while the sum is 60.

The spelling of 643770774474 in words is "six hundred forty-three billion, seven hundred seventy million, seven hundred seventy-four thousand, four hundred seventy-four".