73638686999 has 2 divisors, whose sum is σ = 73638687000. Its totient is φ = 73638686998.

The previous prime is 73638686983. The next prime is 73638687013. The reversal of 73638686999 is 99968683637.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73638686999 - 2⁴ = 73638686983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73638686909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36819343499 + 36819343500.

It is an arithmetic number, because the mean of its divisors is an integer number (36819343500).

Almost surely, 2^73638686999 is an apocalyptic number.

73638686999 is a deficient number, since it is larger than the sum of its proper divisors (1).

73638686999 is an equidigital number, since it uses as much as digits as its factorization.

73638686999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 634894848, while the sum is 74.

The spelling of 73638686999 in words is "seventy-three billion, six hundred thirty-eight million, six hundred eighty-six thousand, nine hundred ninety-nine".