18210253457 has 4 divisors (see below), whose sum is σ = 19865731056. Its totient is φ = 16554775860.

The previous prime is 18210253357. The next prime is 18210253483. The reversal of 18210253457 is 75435201281.

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 not a de Polignac number, because 18210253457 - 2²⁴ = 18193476241 is a prime.

It is a super-2 number, since 2×18210253457² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18210253457.

It is not an unprimeable number, because it can be changed into a prime (18210253057) 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, 827738783 + ... + 827738804.

It is an arithmetic number, because the mean of its divisors is an integer number (4966432764).

Almost surely, 2^18210253457 is an apocalyptic number.

It is an amenable number.

18210253457 is a deficient number, since it is larger than the sum of its proper divisors (1655477599).

18210253457 is a wasteful number, since it uses less digits than its factorization.

18210253457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655477598.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 18210253457 in words is "eighteen billion, two hundred ten million, two hundred fifty-three thousand, four hundred fifty-seven".