50665621 has 2 divisors, whose sum is σ = 50665622. Its totient is φ = 50665620.

The previous prime is 50665613. The next prime is 50665631. The reversal of 50665621 is 12656605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35533521 + 15132100 = 5961^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 50665621 - 2³ = 50665613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50665631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25332810 + 25332811.

It is an arithmetic number, because the mean of its divisors is an integer number (25332811).

Almost surely, 2^50665621 is an apocalyptic number.

It is an amenable number.

50665621 is a deficient number, since it is larger than the sum of its proper divisors (1).

50665621 is an equidigital number, since it uses as much as digits as its factorization.

50665621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 50665621 is about 7117.9787158996. The cubic root of 50665621 is about 370.0307279082.

The spelling of 50665621 in words is "fifty million, six hundred sixty-five thousand, six hundred twenty-one".