18523552357 has 4 divisors (see below), whose sum is σ = 19121086336. Its totient is φ = 17926018380.

The previous prime is 18523552349. The next prime is 18523552379. The reversal of 18523552357 is 75325532581.

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: 75325532581 = 13 ⋅5794271737.

It is a cyclic number.

It is not a de Polignac number, because 18523552357 - 2³ = 18523552349 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 (18523552657) 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, 298766943 + ... + 298767004.

It is an arithmetic number, because the mean of its divisors is an integer number (4780271584).

Almost surely, 2^18523552357 is an apocalyptic number.

It is an amenable number.

18523552357 is a deficient number, since it is larger than the sum of its proper divisors (597533979).

18523552357 is an equidigital number, since it uses as much as digits as its factorization.

18523552357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597533978.

The product of its digits is 1260000, while the sum is 46.

The spelling of 18523552357 in words is "eighteen billion, five hundred twenty-three million, five hundred fifty-two thousand, three hundred fifty-seven".