640405156430 has 64 divisors (see below), whose sum is σ = 1254086826048. Its totient is φ = 234052976640.

The previous prime is 640405156423. The next prime is 640405156471. The reversal of 640405156430 is 34651504046.

640405156430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5042510 + ... + 5167950.

It is an arithmetic number, because the mean of its divisors is an integer number (19595106657).

Almost surely, 2^640405156430 is an apocalyptic number.

640405156430 is a deficient number, since it is larger than the sum of its proper divisors (613681669618).

640405156430 is a wasteful number, since it uses less digits than its factorization.

640405156430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125861.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 640405156430 in words is "six hundred forty billion, four hundred five million, one hundred fifty-six thousand, four hundred thirty".