640361016431 has 2 divisors, whose sum is σ = 640361016432. Its totient is φ = 640361016430.

The previous prime is 640361016371. The next prime is 640361016443. The reversal of 640361016431 is 134610163046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640361016431 - 2⁶ = 640361016367 is a prime.

It is a super-2 number, since 2×640361016431² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640361016391 and 640361016400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640361016461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320180508215 + 320180508216.

It is an arithmetic number, because the mean of its divisors is an integer number (320180508216).

Almost surely, 2^640361016431 is an apocalyptic number.

640361016431 is a deficient number, since it is larger than the sum of its proper divisors (1).

640361016431 is an equidigital number, since it uses as much as digits as its factorization.

640361016431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 640361016431 its reverse (134610163046), we get a palindrome (774971179477).

The spelling of 640361016431 in words is "six hundred forty billion, three hundred sixty-one million, sixteen thousand, four hundred thirty-one".