640310457257131 has 4 divisors (see below), whose sum is σ = 640310542596064. Its totient is φ = 640310371918200.

The previous prime is 640310457257099. The next prime is 640310457257137. The reversal of 640310457257131 is 131752754013046.

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 640310457257131 - 2⁵ = 640310457257099 is a prime.

It is a super-2 number, since 2×640310457257131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640310457257137) 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, 30200100 + ... + 46825921.

It is an arithmetic number, because the mean of its divisors is an integer number (160077635649016).

Almost surely, 2^{640310457257131} is an apocalyptic number.

640310457257131 is a deficient number, since it is larger than the sum of its proper divisors (85338933).

640310457257131 is an equidigital number, since it uses as much as digits as its factorization.

640310457257131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85338932.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 640310457257131 in words is "six hundred forty trillion, three hundred ten billion, four hundred fifty-seven million, two hundred fifty-seven thousand, one hundred thirty-one".