6749917352621 has 2 divisors, whose sum is σ = 6749917352622. Its totient is φ = 6749917352620.

The previous prime is 6749917352597. The next prime is 6749917352653. The reversal of 6749917352621 is 1262537199476.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4246525704100 + 2503391648521 = 2060710^2 + 1582211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6749917352621 is a prime.

It is a super-2 number, since 2×6749917352621² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6749910352621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3374958676310 + 3374958676311.

It is an arithmetic number, because the mean of its divisors is an integer number (3374958676311).

Almost surely, 2^{6749917352621} is an apocalyptic number.

It is an amenable number.

6749917352621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6749917352621 is an equidigital number, since it uses as much as digits as its factorization.

6749917352621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160, while the sum is 62.

The spelling of 6749917352621 in words is "six trillion, seven hundred forty-nine billion, nine hundred seventeen million, three hundred fifty-two thousand, six hundred twenty-one".