67640644604677 has 2 divisors, whose sum is σ = 67640644604678. Its totient is φ = 67640644604676.

The previous prime is 67640644604633. The next prime is 67640644604683. The reversal of 67640644604677 is 77640644604676.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67118596448836 + 522048155841 = 8192594^2 + 722529^2 .

It is a cyclic number.

It is not a de Polignac number, because 67640644604677 - 2³⁹ = 67090888790789 is a prime.

It is a super-2 number, since 2×67640644604677² (a number of 28 digits) contains 22 as substring.

It is a pancake number, because a pancake can be divided into 67640644604677 parts by 11631048 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67640644304677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33820322302338 + 33820322302339.

It is an arithmetic number, because the mean of its divisors is an integer number (33820322302339).

Almost surely, 2^{67640644604677} is an apocalyptic number.

It is an amenable number.

67640644604677 is a deficient number, since it is larger than the sum of its proper divisors (1).

67640644604677 is an equidigital number, since it uses as much as digits as its factorization.

67640644604677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 682795008, while the sum is 67.

Subtracting 67640644604677 from its reverse (77640644604676), we obtain a palindrome (9999999999999).

The spelling of 67640644604677 in words is "sixty-seven trillion, six hundred forty billion, six hundred forty-four million, six hundred four thousand, six hundred seventy-seven".