67640644588291 has 2 divisors, whose sum is σ = 67640644588292. Its totient is φ = 67640644588290.

The previous prime is 67640644588249. The next prime is 67640644588327. The reversal of 67640644588291 is 19288544604676.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67640644588291 - 2²⁹ = 67640107717379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67640644588291.

It is not a weakly prime, because it can be changed into another prime (67640644688291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33820322294145 + 33820322294146.

It is an arithmetic number, because the mean of its divisors is an integer number (33820322294146).

Almost surely, 2^{67640644588291} is an apocalyptic number.

67640644588291 is a deficient number, since it is larger than the sum of its proper divisors (1).

67640644588291 is an equidigital number, since it uses as much as digits as its factorization.

67640644588291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 557383680, while the sum is 70.

The spelling of 67640644588291 in words is "sixty-seven trillion, six hundred forty billion, six hundred forty-four million, five hundred eighty-eight thousand, two hundred ninety-one".