6625037503561 has 2 divisors, whose sum is σ = 6625037503562. Its totient is φ = 6625037503560.

The previous prime is 6625037503559. The next prime is 6625037503571. The reversal of 6625037503561 is 1653057305266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4275255093561 + 2349782410000 = 2067669^2 + 1532900^2 .

It is a cyclic number.

It is not a de Polignac number, because 6625037503561 - 2¹ = 6625037503559 is a prime.

It is a super-2 number, since 2×6625037503561² (a number of 26 digits) contains 22 as substring.

Together with 6625037503559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6625037503501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312518751780 + 3312518751781.

It is an arithmetic number, because the mean of its divisors is an integer number (3312518751781).

Almost surely, 2^{6625037503561} is an apocalyptic number.

It is an amenable number.

6625037503561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6625037503561 is an equidigital number, since it uses as much as digits as its factorization.

6625037503561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402000, while the sum is 49.

The spelling of 6625037503561 in words is "six trillion, six hundred twenty-five billion, thirty-seven million, five hundred three thousand, five hundred sixty-one".