640312556613 has 8 divisors (see below), whose sum is σ = 856329382176. Its totient is φ = 425585384400.

The previous prime is 640312556567. The next prime is 640312556683. The reversal of 640312556613 is 316655213046.

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

It is not a de Polignac number, because 640312556613 - 2⁹ = 640312556101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640312556683) 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, 322412178 + ... + 322414163.

It is an arithmetic number, because the mean of its divisors is an integer number (107041172772).

Almost surely, 2^640312556613 is an apocalyptic number.

It is an amenable number.

640312556613 is a deficient number, since it is larger than the sum of its proper divisors (216016825563).

640312556613 is a wasteful number, since it uses less digits than its factorization.

640312556613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644826675.

The product of its (nonzero) digits is 388800, while the sum is 42.

Adding to 640312556613 its reverse (316655213046), we get a palindrome (956967769659).

The spelling of 640312556613 in words is "six hundred forty billion, three hundred twelve million, five hundred fifty-six thousand, six hundred thirteen".