6624647451839 has 4 divisors (see below), whose sum is σ = 6733248229800. Its totient is φ = 6516046673880.

The previous prime is 6624647451833. The next prime is 6624647451949. The reversal of 6624647451839 is 9381547464266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6624647451839 is a prime.

It is a super-2 number, since 2×6624647451839² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6624647451833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54300388889 + ... + 54300389010.

It is an arithmetic number, because the mean of its divisors is an integer number (1683312057450).

Almost surely, 2^{6624647451839} is an apocalyptic number.

6624647451839 is a deficient number, since it is larger than the sum of its proper divisors (108600777961).

6624647451839 is a wasteful number, since it uses less digits than its factorization.

6624647451839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108600777960.

The product of its digits is 209018880, while the sum is 65.

The spelling of 6624647451839 in words is "six trillion, six hundred twenty-four billion, six hundred forty-seven million, four hundred fifty-one thousand, eight hundred thirty-nine".