63626621 has 2 divisors, whose sum is σ = 63626622. Its totient is φ = 63626620.

The previous prime is 63626543. The next prime is 63626639. The reversal of 63626621 is 12662636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51998521 + 11628100 = 7211^2 + 3410^2 .

It is a cyclic number.

It is not a de Polignac number, because 63626621 - 2¹⁴ = 63610237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63626681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31813310 + 31813311.

It is an arithmetic number, because the mean of its divisors is an integer number (31813311).

Almost surely, 2^63626621 is an apocalyptic number.

It is an amenable number.

63626621 is a deficient number, since it is larger than the sum of its proper divisors (1).

63626621 is an equidigital number, since it uses as much as digits as its factorization.

63626621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 63626621 is about 7976.6296767494. The cubic root of 63626621 is about 399.2206094456.

The spelling of 63626621 in words is "sixty-three million, six hundred twenty-six thousand, six hundred twenty-one".