39041663621 has 2 divisors, whose sum is σ = 39041663622. Its totient is φ = 39041663620.

The previous prime is 39041663597. The next prime is 39041663641. The reversal of 39041663621 is 12636614093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21342288100 + 17699375521 = 146090^2 + 133039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39041663621 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39041663641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19520831810 + 19520831811.

It is an arithmetic number, because the mean of its divisors is an integer number (19520831811).

Almost surely, 2^39041663621 is an apocalyptic number.

It is an amenable number.

39041663621 is a deficient number, since it is larger than the sum of its proper divisors (1).

39041663621 is an equidigital number, since it uses as much as digits as its factorization.

39041663621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 39041663621 in words is "thirty-nine billion, forty-one million, six hundred sixty-three thousand, six hundred twenty-one".