640272481267 has 8 divisors (see below), whose sum is σ = 662362992000. Its totient is φ = 618182780544.

The previous prime is 640272481243. The next prime is 640272481273. The reversal of 640272481267 is 762184272046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640272481267 - 2²³ = 640264092659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640272481267.

It is not an unprimeable number, because it can be changed into a prime (640272481237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712859 + ... + 2052907.

It is an arithmetic number, because the mean of its divisors is an integer number (82795374000).

Almost surely, 2^640272481267 is an apocalyptic number.

640272481267 is a deficient number, since it is larger than the sum of its proper divisors (22090510733).

640272481267 is a wasteful number, since it uses less digits than its factorization.

640272481267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405005.

The product of its (nonzero) digits is 1806336, while the sum is 49.

The spelling of 640272481267 in words is "six hundred forty billion, two hundred seventy-two million, four hundred eighty-one thousand, two hundred sixty-seven".