199682960621 has 2 divisors, whose sum is σ = 199682960622. Its totient is φ = 199682960620.

The previous prime is 199682960567. The next prime is 199682960651. The reversal of 199682960621 is 126069286991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109193898025 + 90489062596 = 330445^2 + 300814^2 .

It is a cyclic number.

It is not a de Polignac number, because 199682960621 - 2¹⁸ = 199682698477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199682960651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99841480310 + 99841480311.

It is an arithmetic number, because the mean of its divisors is an integer number (99841480311).

Almost surely, 2^199682960621 is an apocalyptic number.

It is an amenable number.

199682960621 is a deficient number, since it is larger than the sum of its proper divisors (1).

199682960621 is an equidigital number, since it uses as much as digits as its factorization.

199682960621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The spelling of 199682960621 in words is "one hundred ninety-nine billion, six hundred eighty-two million, nine hundred sixty thousand, six hundred twenty-one".