38506538621 has 2 divisors, whose sum is σ = 38506538622. Its totient is φ = 38506538620.

The previous prime is 38506538599. The next prime is 38506538641. The reversal of 38506538621 is 12683560583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21473678521 + 17032860100 = 146539^2 + 130510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38506538621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38506538641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19253269310 + 19253269311.

It is an arithmetic number, because the mean of its divisors is an integer number (19253269311).

Almost surely, 2^38506538621 is an apocalyptic number.

It is an amenable number.

38506538621 is a deficient number, since it is larger than the sum of its proper divisors (1).

38506538621 is an equidigital number, since it uses as much as digits as its factorization.

38506538621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 38506538621 in words is "thirty-eight billion, five hundred six million, five hundred thirty-eight thousand, six hundred twenty-one".