998962940639 has 2 divisors, whose sum is σ = 998962940640. Its totient is φ = 998962940638.

The previous prime is 998962940627. The next prime is 998962940641. The reversal of 998962940639 is 936049269899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998962940639 - 2¹⁶ = 998962875103 is a prime.

It is a Sophie Germain prime.

Together with 998962940641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998962910639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499481470319 + 499481470320.

It is an arithmetic number, because the mean of its divisors is an integer number (499481470320).

Almost surely, 2^998962940639 is an apocalyptic number.

998962940639 is a deficient number, since it is larger than the sum of its proper divisors (1).

998962940639 is an equidigital number, since it uses as much as digits as its factorization.

998962940639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408146688, while the sum is 74.

The spelling of 998962940639 in words is "nine hundred ninety-eight billion, nine hundred sixty-two million, nine hundred forty thousand, six hundred thirty-nine".