18229136987 has 8 divisors (see below), whose sum is σ = 18854599680. Its totient is φ = 17606013480.

The previous prime is 18229136983. The next prime is 18229137029. The reversal of 18229136987 is 78963192281.

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

It is a cyclic number.

It is not a de Polignac number, because 18229136987 - 2² = 18229136983 is a prime.

It is a super-2 number, since 2×18229136987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18229136983) 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, 568937 + ... + 600122.

It is an arithmetic number, because the mean of its divisors is an integer number (2356824960).

Almost surely, 2^18229136987 is an apocalyptic number.

18229136987 is a deficient number, since it is larger than the sum of its proper divisors (625462693).

18229136987 is a wasteful number, since it uses less digits than its factorization.

18229136987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169593.

The product of its digits is 2612736, while the sum is 56.

The spelling of 18229136987 in words is "eighteen billion, two hundred twenty-nine million, one hundred thirty-six thousand, nine hundred eighty-seven".