664040053 has 4 divisors (see below), whose sum is σ = 664699180. Its totient is φ = 663380928.

The previous prime is 664040011. The next prime is 664040081. The reversal of 664040053 is 350040466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63888049 + 600152004 = 7993^2 + 24498^2 .

It is a cyclic number.

It is not a de Polignac number, because 664040053 - 2²¹ = 661942901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664940053) 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, 328050 + ... + 330067.

It is an arithmetic number, because the mean of its divisors is an integer number (166174795).

Almost surely, 2^664040053 is an apocalyptic number.

It is an amenable number.

664040053 is a deficient number, since it is larger than the sum of its proper divisors (659127).

664040053 is a wasteful number, since it uses less digits than its factorization.

664040053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659126.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 664040053 is about 25768.9746206557. The cubic root of 664040053 is about 872.4316755062.

The spelling of 664040053 in words is "six hundred sixty-four million, forty thousand, fifty-three".