18294139657 has 8 divisors (see below), whose sum is σ = 18324298440. Its totient is φ = 18264005760.

The previous prime is 18294139627. The next prime is 18294139679. The reversal of 18294139657 is 75693149281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9994200841 + 8299938816 = 99971^2 + 91104^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18294139657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18294139598 and 18294139607.

It is not an unprimeable number, because it can be changed into a prime (18294139627) 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, 1928907 + ... + 1938367.

It is an arithmetic number, because the mean of its divisors is an integer number (2290537305).

Almost surely, 2^18294139657 is an apocalyptic number.

It is an amenable number.

18294139657 is a deficient number, since it is larger than the sum of its proper divisors (30158783).

18294139657 is an equidigital number, since it uses as much as digits as its factorization.

18294139657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12443.

The product of its digits is 3265920, while the sum is 55.

The spelling of 18294139657 in words is "eighteen billion, two hundred ninety-four million, one hundred thirty-nine thousand, six hundred fifty-seven".