6623557637 has 2 divisors, whose sum is σ = 6623557638. Its totient is φ = 6623557636.

The previous prime is 6623557597. The next prime is 6623557657. The reversal of 6623557637 is 7367553266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5678978881 + 944578756 = 75359^2 + 30734^2 .

It is a cyclic number.

It is not a de Polignac number, because 6623557637 - 2¹⁰ = 6623556613 is a prime.

It is a super-2 number, since 2×6623557637² = 87743031541322047538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6623557657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311778818 + 3311778819.

It is an arithmetic number, because the mean of its divisors is an integer number (3311778819).

Almost surely, 2^6623557637 is an apocalyptic number.

It is an amenable number.

6623557637 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623557637 is an equidigital number, since it uses as much as digits as its factorization.

6623557637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800, while the sum is 50.

The square root of 6623557637 is about 81385.2421327110. The cubic root of 6623557637 is about 1878.0065671527.

The spelling of 6623557637 in words is "six billion, six hundred twenty-three million, five hundred fifty-seven thousand, six hundred thirty-seven".