99405424639 has 2 divisors, whose sum is σ = 99405424640. Its totient is φ = 99405424638.

The previous prime is 99405424637. The next prime is 99405424687. The reversal of 99405424639 is 93642450499.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99405424639 - 2¹ = 99405424637 is a prime.

Together with 99405424637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 99405424639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99405424637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49702712319 + 49702712320.

It is an arithmetic number, because the mean of its divisors is an integer number (49702712320).

Almost surely, 2^99405424639 is an apocalyptic number.

99405424639 is a deficient number, since it is larger than the sum of its proper divisors (1).

99405424639 is an equidigital number, since it uses as much as digits as its factorization.

99405424639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 99405424639 in words is "ninety-nine billion, four hundred five million, four hundred twenty-four thousand, six hundred thirty-nine".