17872358409 has 36 divisors (see below), whose sum is σ = 26962249860. Its totient is φ = 11394626880.

The previous prime is 17872358393. The next prime is 17872358423. The reversal of 17872358409 is 90485327871.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3918134025 + 13954224384 = 62595^2 + 118128^2 .

It is not a de Polignac number, because 17872358409 - 2⁴ = 17872358393 is a prime.

It is a super-2 number, since 2×17872358409² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17872358209) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2985199 + ... + 2991179.

It is an arithmetic number, because the mean of its divisors is an integer number (748951385).

Almost surely, 2^17872358409 is an apocalyptic number.

It is an amenable number.

17872358409 is a deficient number, since it is larger than the sum of its proper divisors (9089891451).

17872358409 is a wasteful number, since it uses less digits than its factorization.

17872358409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6230 (or 6120 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 17872358409 in words is "seventeen billion, eight hundred seventy-two million, three hundred fifty-eight thousand, four hundred nine".