640842262406 has 8 divisors (see below), whose sum is σ = 961451412744. Its totient is φ = 320358458160.

The previous prime is 640842262393. The next prime is 640842262427. The reversal of 640842262406 is 604262248046.

640842262406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31323740 + ... + 31344191.

It is an arithmetic number, because the mean of its divisors is an integer number (120181426593).

Almost surely, 2^640842262406 is an apocalyptic number.

640842262406 is a deficient number, since it is larger than the sum of its proper divisors (320609150338).

640842262406 is a wasteful number, since it uses less digits than its factorization.

640842262406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62673046.

The product of its (nonzero) digits is 884736, while the sum is 44.

The spelling of 640842262406 in words is "six hundred forty billion, eight hundred forty-two million, two hundred sixty-two thousand, four hundred six".