640451059 has 4 divisors (see below), whose sum is σ = 640596040. Its totient is φ = 640306080.

The previous prime is 640451039. The next prime is 640451101. The reversal of 640451059 is 950154046.

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

It is a cyclic number.

It is not a de Polignac number, because 640451059 - 2⁷ = 640450931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640451039) 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, 65649 + ... + 74770.

It is an arithmetic number, because the mean of its divisors is an integer number (160149010).

Almost surely, 2^640451059 is an apocalyptic number.

640451059 is a deficient number, since it is larger than the sum of its proper divisors (144981).

640451059 is a wasteful number, since it uses less digits than its factorization.

640451059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144980.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 640451059 is about 25307.1345473959. The cubic root of 640451059 is about 861.9762820440.

The spelling of 640451059 in words is "six hundred forty million, four hundred fifty-one thousand, fifty-nine".