18390145597 has 4 divisors (see below), whose sum is σ = 18701843040. Its totient is φ = 18078448156.

The previous prime is 18390145583. The next prime is 18390145639. The reversal of 18390145597 is 79554109381.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18390145597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390145507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155848633 + ... + 155848750.

It is an arithmetic number, because the mean of its divisors is an integer number (4675460760).

Almost surely, 2^18390145597 is an apocalyptic number.

It is an amenable number.

18390145597 is a deficient number, since it is larger than the sum of its proper divisors (311697443).

18390145597 is an equidigital number, since it uses as much as digits as its factorization.

18390145597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311697442.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 18390145597 in words is "eighteen billion, three hundred ninety million, one hundred forty-five thousand, five hundred ninety-seven".