18257790373 has 4 divisors (see below), whose sum is σ = 19331778060. Its totient is φ = 17183802688.

The previous prime is 18257790361. The next prime is 18257790389. The reversal of 18257790373 is 37309775281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12590410849 + 5667379524 = 112207^2 + 75282^2 .

It is a cyclic number.

It is not a de Polignac number, because 18257790373 - 2¹³ = 18257782181 is a prime.

It is a super-4 number, since 4×18257790373⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 18257790373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18257790323) 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, 536993818 + ... + 536993851.

It is an arithmetic number, because the mean of its divisors is an integer number (4832944515).

Almost surely, 2^18257790373 is an apocalyptic number.

It is an amenable number.

18257790373 is a deficient number, since it is larger than the sum of its proper divisors (1073987687).

18257790373 is a wasteful number, since it uses less digits than its factorization.

18257790373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073987686.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 18257790373 in words is "eighteen billion, two hundred fifty-seven million, seven hundred ninety thousand, three hundred seventy-three".