15315816487 has 8 divisors (see below), whose sum is σ = 15984163440. Its totient is φ = 14656817280.

The previous prime is 15315816479. The next prime is 15315816493. The reversal of 15315816487 is 78461851351.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15315816487 - 2³ = 15315816479 is a prime.

It is a super-2 number, since 2×15315816487² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15315816487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15315816427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2333589 + ... + 2340142.

It is an arithmetic number, because the mean of its divisors is an integer number (1998020430).

Almost surely, 2^15315816487 is an apocalyptic number.

15315816487 is a deficient number, since it is larger than the sum of its proper divisors (668346953).

15315816487 is a wasteful number, since it uses less digits than its factorization.

15315816487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673873.

The product of its digits is 806400, while the sum is 49.

The spelling of 15315816487 in words is "fifteen billion, three hundred fifteen million, eight hundred sixteen thousand, four hundred eighty-seven".