9942685639 has 2 divisors, whose sum is σ = 9942685640. Its totient is φ = 9942685638.

The previous prime is 9942685609. The next prime is 9942685651. The reversal of 9942685639 is 9365862499.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9942685639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9942685609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4971342819 + 4971342820.

It is an arithmetic number, because the mean of its divisors is an integer number (4971342820).

Almost surely, 2^9942685639 is an apocalyptic number.

9942685639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9942685639 is an equidigital number, since it uses as much as digits as its factorization.

9942685639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 61.

The square root of 9942685639 is about 99713.0163970582. The cubic root of 9942685639 is about 2150.3107997781.

The spelling of 9942685639 in words is "nine billion, nine hundred forty-two million, six hundred eighty-five thousand, six hundred thirty-nine".