640279690151 has 4 divisors (see below), whose sum is σ = 640307501904. Its totient is φ = 640251878400.

The previous prime is 640279690117. The next prime is 640279690181. The reversal of 640279690151 is 151096972046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640279690151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640279690151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640279690181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13871315 + ... + 13917396.

It is an arithmetic number, because the mean of its divisors is an integer number (160076875476).

Almost surely, 2^640279690151 is an apocalyptic number.

640279690151 is a deficient number, since it is larger than the sum of its proper divisors (27811753).

640279690151 is a wasteful number, since it uses less digits than its factorization.

640279690151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27811752.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 640279690151 in words is "six hundred forty billion, two hundred seventy-nine million, six hundred ninety thousand, one hundred fifty-one".