18860968409 has 8 divisors (see below), whose sum is σ = 19512981000. Its totient is φ = 18209064832.

The previous prime is 18860968387. The next prime is 18860968417. The reversal of 18860968409 is 90486906881.

It can be written as a sum of positive squares in 4 ways, for example, as 582739600 + 18278228809 = 24140^2 + 135197^2 .

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 18860968409 - 2³² = 14566001113 is a prime.

It is a super-2 number, since 2×18860968409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18860968309) 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, 493997 + ... + 530805.

It is an arithmetic number, because the mean of its divisors is an integer number (2439122625).

Almost surely, 2^18860968409 is an apocalyptic number.

It is an amenable number.

18860968409 is a deficient number, since it is larger than the sum of its proper divisors (652012591).

18860968409 is a wasteful number, since it uses less digits than its factorization.

18860968409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54507.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The spelling of 18860968409 in words is "eighteen billion, eight hundred sixty million, nine hundred sixty-eight thousand, four hundred nine".