17985010815 has 24 divisors (see below), whose sum is σ = 31178291040. Its totient is φ = 9590691264.

The previous prime is 17985010807. The next prime is 17985010817. The reversal of 17985010815 is 51801058971.

It is not a de Polignac number, because 17985010815 - 2³ = 17985010807 is a prime.

It is a super-2 number, since 2×17985010815² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17985010817) 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, 367054 + ... + 413156.

It is an arithmetic number, because the mean of its divisors is an integer number (1299095460).

Almost surely, 2^17985010815 is an apocalyptic number.

17985010815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

17985010815 is a deficient number, since it is larger than the sum of its proper divisors (13193280225).

17985010815 is a wasteful number, since it uses less digits than its factorization.

17985010815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54783 (or 54780 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The spelling of 17985010815 in words is "seventeen billion, nine hundred eighty-five million, ten thousand, eight hundred fifteen".