18697325749 has 4 divisors (see below), whose sum is σ = 18697662880. Its totient is φ = 18696988620.

The previous prime is 18697325723. The next prime is 18697325809. The reversal of 18697325749 is 94752379681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94752379681 = 17 ⋅5573669393.

It is a cyclic number.

It is not a de Polignac number, because 18697325749 - 2²¹ = 18695228597 is a prime.

It is a super-2 number, since 2×18697325749² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18697325719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63579 + ... + 203560.

It is an arithmetic number, because the mean of its divisors is an integer number (4674415720).

Almost surely, 2^18697325749 is an apocalyptic number.

It is an amenable number.

18697325749 is a deficient number, since it is larger than the sum of its proper divisors (337131).

18697325749 is an equidigital number, since it uses as much as digits as its factorization.

18697325749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337130.

The product of its digits is 22861440, while the sum is 61.

The spelling of 18697325749 in words is "eighteen billion, six hundred ninety-seven million, three hundred twenty-five thousand, seven hundred forty-nine".