640264328417 has 4 divisors (see below), whose sum is σ = 731730661056. Its totient is φ = 548797995780.

The previous prime is 640264328413. The next prime is 640264328437. The reversal of 640264328417 is 714823462046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 714823462046 = 2 ⋅357411731023.

It is a cyclic number.

It is not a de Polignac number, because 640264328417 - 2² = 640264328413 is a prime.

It is a super-4 number, since 4×640264328417⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640264328411) 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, 45733166309 + ... + 45733166322.

It is an arithmetic number, because the mean of its divisors is an integer number (182932665264).

Almost surely, 2^640264328417 is an apocalyptic number.

It is an amenable number.

640264328417 is a deficient number, since it is larger than the sum of its proper divisors (91466332639).

640264328417 is an equidigital number, since it uses as much as digits as its factorization.

640264328417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91466332638.

The product of its (nonzero) digits is 1548288, while the sum is 47.

The spelling of 640264328417 in words is "six hundred forty billion, two hundred sixty-four million, three hundred twenty-eight thousand, four hundred seventeen".