640705504627 has 8 divisors (see below), whose sum is σ = 663261366240. Its totient is φ = 618180480960.

The previous prime is 640705504597. The next prime is 640705504639. The reversal of 640705504627 is 726405507046.

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

It is a cyclic number.

It is not a de Polignac number, because 640705504627 - 2¹⁵ = 640705471859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640705504687) 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, 7667199 + ... + 7750312.

It is an arithmetic number, because the mean of its divisors is an integer number (82907670780).

Almost surely, 2^640705504627 is an apocalyptic number.

640705504627 is a deficient number, since it is larger than the sum of its proper divisors (22555861613).

640705504627 is a wasteful number, since it uses less digits than its factorization.

640705504627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15418973.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 640705504627 in words is "six hundred forty billion, seven hundred five million, five hundred four thousand, six hundred twenty-seven".