18507223131 has 8 divisors (see below), whose sum is σ = 24685630464. Its totient is φ = 12333482280.

The previous prime is 18507223081. The next prime is 18507223153. The reversal of 18507223131 is 13132270581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18507223131 - 2¹³ = 18507214939 is a prime.

It is a super-2 number, since 2×18507223131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18507223092 and 18507223101.

It is not an unprimeable number, because it can be changed into a prime (18507223181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157355 + ... + 1173236.

It is an arithmetic number, because the mean of its divisors is an integer number (3085703808).

Almost surely, 2^18507223131 is an apocalyptic number.

18507223131 is a deficient number, since it is larger than the sum of its proper divisors (6178407333).

18507223131 is a wasteful number, since it uses less digits than its factorization.

18507223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333241.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 18507223131 in words is "eighteen billion, five hundred seven million, two hundred twenty-three thousand, one hundred thirty-one".