6623659919749 has 2 divisors, whose sum is σ = 6623659919750. Its totient is φ = 6623659919748.

The previous prime is 6623659919731. The next prime is 6623659919759. The reversal of 6623659919749 is 9479199563266.

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., 6450431652900 + 173228266849 = 2539770^2 + 416207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6623659919749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6623659919719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311829959874 + 3311829959875.

It is an arithmetic number, because the mean of its divisors is an integer number (3311829959875).

Almost surely, 2^{6623659919749} is an apocalyptic number.

It is an amenable number.

6623659919749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623659919749 is an equidigital number, since it uses as much as digits as its factorization.

6623659919749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190427840, while the sum is 76.

The spelling of 6623659919749 in words is "six trillion, six hundred twenty-three billion, six hundred fifty-nine million, nine hundred nineteen thousand, seven hundred forty-nine".