640115494351 has 2 divisors, whose sum is σ = 640115494352. Its totient is φ = 640115494350.

The previous prime is 640115494331. The next prime is 640115494429. The reversal of 640115494351 is 153494511046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640115494351 - 2⁷ = 640115494223 is a prime.

It is a super-2 number, since 2×640115494351² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640115494298 and 640115494307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640115494321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320057747175 + 320057747176.

It is an arithmetic number, because the mean of its divisors is an integer number (320057747176).

Almost surely, 2^640115494351 is an apocalyptic number.

640115494351 is a deficient number, since it is larger than the sum of its proper divisors (1).

640115494351 is an equidigital number, since it uses as much as digits as its factorization.

640115494351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 640115494351 in words is "six hundred forty billion, one hundred fifteen million, four hundred ninety-four thousand, three hundred fifty-one".