15493679999 has 24 divisors (see below), whose sum is σ = 18616422528. Its totient is φ = 12843774720.

The previous prime is 15493679987. The next prime is 15493680023. The reversal of 15493679999 is 99997639451.

It is not a de Polignac number, because 15493679999 - 2⁸ = 15493679743 is a prime.

It is a super-2 number, since 2×15493679999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15493679099) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4216427 + ... + 4220099.

It is an arithmetic number, because the mean of its divisors is an integer number (775684272).

Almost surely, 2^15493679999 is an apocalyptic number.

15493679999 is a deficient number, since it is larger than the sum of its proper divisors (3122742529).

15493679999 is a wasteful number, since it uses less digits than its factorization.

15493679999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6495 (or 6488 counting only the distinct ones).

The product of its digits is 148803480, while the sum is 71.

The spelling of 15493679999 in words is "fifteen billion, four hundred ninety-three million, six hundred seventy-nine thousand, nine hundred ninety-nine".