18258227493 has 16 divisors (see below), whose sum is σ = 26561203776. Its totient is φ = 11064016640.

The previous prime is 18258227483. The next prime is 18258227501. The reversal of 18258227493 is 39472285281.

It is a cyclic number.

It is not a de Polignac number, because 18258227493 - 2³³ = 9668292901 is a prime.

It is a super-2 number, since 2×18258227493² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18258227473) 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, 221671 + ... + 292667.

It is an arithmetic number, because the mean of its divisors is an integer number (1660075236).

Almost surely, 2^18258227493 is an apocalyptic number.

It is an amenable number.

18258227493 is a deficient number, since it is larger than the sum of its proper divisors (8302976283).

18258227493 is a wasteful number, since it uses less digits than its factorization.

18258227493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78804.

The product of its digits is 1935360, while the sum is 51.

The spelling of 18258227493 in words is "eighteen billion, two hundred fifty-eight million, two hundred twenty-seven thousand, four hundred ninety-three".