18997967158 has 8 divisors (see below), whose sum is σ = 28597647528. Its totient is φ = 9465417984.

The previous prime is 18997967117. The next prime is 18997967207. The reversal of 18997967158 is 85176979981.

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

It is a super-2 number, since 2×18997967158² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16782091 + ... + 16783222.

It is an arithmetic number, because the mean of its divisors is an integer number (3574705941).

Almost surely, 2^18997967158 is an apocalyptic number.

18997967158 is a deficient number, since it is larger than the sum of its proper divisors (9599680370).

18997967158 is a wasteful number, since it uses less digits than its factorization.

18997967158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33565598.

The product of its digits is 68584320, while the sum is 70.

The spelling of 18997967158 in words is "eighteen billion, nine hundred ninety-seven million, nine hundred sixty-seven thousand, one hundred fifty-eight".