15638624489 has 2 divisors, whose sum is σ = 15638624490. Its totient is φ = 15638624488.

The previous prime is 15638624459. The next prime is 15638624579. The reversal of 15638624489 is 98442683651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13097658025 + 2540966464 = 114445^2 + 50408^2 .

It is a cyclic number.

It is not a de Polignac number, because 15638624489 - 2⁸ = 15638624233 is a prime.

It is a super-2 number, since 2×15638624489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15638624459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7819312244 + 7819312245.

It is an arithmetic number, because the mean of its divisors is an integer number (7819312245).

Almost surely, 2^15638624489 is an apocalyptic number.

It is an amenable number.

15638624489 is a deficient number, since it is larger than the sum of its proper divisors (1).

15638624489 is an equidigital number, since it uses as much as digits as its factorization.

15638624489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 56.

The spelling of 15638624489 in words is "fifteen billion, six hundred thirty-eight million, six hundred twenty-four thousand, four hundred eighty-nine".