640615460234 has 4 divisors (see below), whose sum is σ = 960923190354. Its totient is φ = 320307730116.

The previous prime is 640615460123. The next prime is 640615460291. The reversal of 640615460234 is 432064516046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 486792267025 + 153823193209 = 697705^2 + 392203^2 .

It is a junction number, because it is equal to n+sod(n) for n = 640615460191 and 640615460200.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160153865057 + ... + 160153865060.

Almost surely, 2^640615460234 is an apocalyptic number.

640615460234 is a deficient number, since it is larger than the sum of its proper divisors (320307730120).

640615460234 is a wasteful number, since it uses less digits than its factorization.

640615460234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320307730119.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 640615460234 in words is "six hundred forty billion, six hundred fifteen million, four hundred sixty thousand, two hundred thirty-four".