640406742474 has 16 divisors (see below), whose sum is σ = 1280825399520. Its totient is φ = 213466928400.

The previous prime is 640406742473. The next prime is 640406742487. The reversal of 640406742474 is 474247604046.

It is not an unprimeable number, because it can be changed into a prime (640406742473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300792 + ... + 1171020.

It is an arithmetic number, because the mean of its divisors is an integer number (80051587470).

Almost surely, 2^640406742474 is an apocalyptic number.

640406742474 is an abundant number, since it is smaller than the sum of its proper divisors (640418657046).

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

640406742474 is a wasteful number, since it uses less digits than its factorization.

640406742474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992885.

The product of its (nonzero) digits is 3612672, while the sum is 48.

The spelling of 640406742474 in words is "six hundred forty billion, four hundred six million, seven hundred forty-two thousand, four hundred seventy-four".