18048815437 has 4 divisors (see below), whose sum is σ = 18049150396. Its totient is φ = 18048480480.

The previous prime is 18048815423. The next prime is 18048815453. The reversal of 18048815437 is 73451884081.

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 15849299236 + 2199516201 = 125894^2 + 46899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18048815437 is a prime.

It is a super-3 number, since 3×18048815437³ (a number of 32 digits) contains 333 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 (18048815417) 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, 66264 + ... + 201217.

It is an arithmetic number, because the mean of its divisors is an integer number (4512287599).

Almost surely, 2^18048815437 is an apocalyptic number.

It is an amenable number.

18048815437 is a deficient number, since it is larger than the sum of its proper divisors (334959).

18048815437 is an equidigital number, since it uses as much as digits as its factorization.

18048815437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334958.

The product of its (nonzero) digits is 860160, while the sum is 49.

The spelling of 18048815437 in words is "eighteen billion, forty-eight million, eight hundred fifteen thousand, four hundred thirty-seven".