18537056447 has 16 divisors (see below), whose sum is σ = 23601560640. Its totient is φ = 14160932352.

The previous prime is 18537056441. The next prime is 18537056459. The reversal of 18537056447 is 74465073581.

It is not a de Polignac number, because 18537056447 - 2⁸ = 18537056191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18537056395 and 18537056404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18537056441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3509498 + ... + 3514775.

It is an arithmetic number, because the mean of its divisors is an integer number (1475097540).

Almost surely, 2^18537056447 is an apocalyptic number.

18537056447 is a deficient number, since it is larger than the sum of its proper divisors (5064504193).

18537056447 is a wasteful number, since it uses less digits than its factorization.

18537056447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024322.

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 18537056447 in words is "eighteen billion, five hundred thirty-seven million, fifty-six thousand, four hundred forty-seven".