18158267668 has 6 divisors (see below), whose sum is σ = 31776968426. Its totient is φ = 9079133832.

The previous prime is 18158267653. The next prime is 18158267671. The reversal of 18158267668 is 86676285181.

It can be written as a sum of positive squares in only one way, i.e., 13917392784 + 4240874884 = 117972^2 + 65122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2269783455 + ... + 2269783462.

Almost surely, 2^18158267668 is an apocalyptic number.

It is an amenable number.

18158267668 is a deficient number, since it is larger than the sum of its proper divisors (13618700758).

18158267668 is a wasteful number, since it uses less digits than its factorization.

18158267668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539566921 (or 4539566919 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 58.

The spelling of 18158267668 in words is "eighteen billion, one hundred fifty-eight million, two hundred sixty-seven thousand, six hundred sixty-eight".