18177399497 has 8 divisors (see below), whose sum is σ = 18347615880. Its totient is φ = 18007246080.

The previous prime is 18177399463. The next prime is 18177399619. The reversal of 18177399497 is 79499377181.

It can be written as a sum of positive squares in 4 ways, for example, as 919059856 + 17258339641 = 30316^2 + 131371^2 .

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 18177399497 - 2¹⁸ = 18177137353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18177399797) 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, 726833 + ... + 751425.

It is an arithmetic number, because the mean of its divisors is an integer number (2293451985).

Almost surely, 2^18177399497 is an apocalyptic number.

It is an amenable number.

18177399497 is a deficient number, since it is larger than the sum of its proper divisors (170216383).

18177399497 is a wasteful number, since it uses less digits than its factorization.

18177399497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31483.

The product of its digits is 24004512, while the sum is 65.

The spelling of 18177399497 in words is "eighteen billion, one hundred seventy-seven million, three hundred ninety-nine thousand, four hundred ninety-seven".