664462402591 has 4 divisors (see below), whose sum is σ = 715574895112. Its totient is φ = 613349910072.

The previous prime is 664462402579. The next prime is 664462402607. The reversal of 664462402591 is 195204264466.

664462402591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664462402591 - 2¹³ = 664462394399 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 (664462402291) 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, 25556246241 + ... + 25556246266.

It is an arithmetic number, because the mean of its divisors is an integer number (178893723778).

Almost surely, 2^664462402591 is an apocalyptic number.

664462402591 is a deficient number, since it is larger than the sum of its proper divisors (51112492521).

664462402591 is a wasteful number, since it uses less digits than its factorization.

664462402591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51112492520.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 664462402591 in words is "six hundred sixty-four billion, four hundred sixty-two million, four hundred two thousand, five hundred ninety-one".