67640644604675 has 24 divisors (see below), whose sum is σ = 84141642207792. Its totient is φ = 53940111696000.

The previous prime is 67640644604633. The next prime is 67640644604677. The reversal of 67640644604675 is 57640644604676.

It is a happy number.

It is not a de Polignac number, because 67640644604675 - 2¹⁴ = 67640644588291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67640644604677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290659865 + ... + 290892485.

It is an arithmetic number, because the mean of its divisors is an integer number (3505901758658).

Almost surely, 2^{67640644604675} is an apocalyptic number.

67640644604675 is a deficient number, since it is larger than the sum of its proper divisors (16500997603117).

67640644604675 is a wasteful number, since it uses less digits than its factorization.

67640644604675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269639 (or 269634 counting only the distinct ones).

The product of its (nonzero) digits is 487710720, while the sum is 65.

Subtracting from 67640644604675 its reverse (57640644604676), we obtain a palindrome (9999999999999).

The spelling of 67640644604675 in words is "sixty-seven trillion, six hundred forty billion, six hundred forty-four million, six hundred four thousand, six hundred seventy-five".