640919462431 has 2 divisors, whose sum is σ = 640919462432. Its totient is φ = 640919462430.

The previous prime is 640919462389. The next prime is 640919462479. The reversal of 640919462431 is 134264919046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640919462431 - 2¹¹ = 640919460383 is a prime.

It is a super-2 number, since 2×640919462431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640919442431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320459731215 + 320459731216.

It is an arithmetic number, because the mean of its divisors is an integer number (320459731216).

Almost surely, 2^640919462431 is an apocalyptic number.

640919462431 is a deficient number, since it is larger than the sum of its proper divisors (1).

640919462431 is an equidigital number, since it uses as much as digits as its factorization.

640919462431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 640919462431 in words is "six hundred forty billion, nine hundred nineteen million, four hundred sixty-two thousand, four hundred thirty-one".