640919462399 has 32 divisors (see below), whose sum is σ = 691199308800. Its totient is φ = 592123392000.

The previous prime is 640919462389. The next prime is 640919462431. The reversal of 640919462399 is 993264919046.

It is a cyclic number.

It is not a de Polignac number, because 640919462399 - 2⁸ = 640919462143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640919462389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303608354 + ... + 303610464.

It is an arithmetic number, because the mean of its divisors is an integer number (21599978400).

Almost surely, 2^640919462399 is an apocalyptic number.

640919462399 is a deficient number, since it is larger than the sum of its proper divisors (50279846401).

640919462399 is a wasteful number, since it uses less digits than its factorization.

640919462399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251.

The product of its (nonzero) digits is 22674816, while the sum is 62.

The spelling of 640919462399 in words is "six hundred forty billion, nine hundred nineteen million, four hundred sixty-two thousand, three hundred ninety-nine".