18148997987 has 8 divisors (see below), whose sum is σ = 19036214304. Its totient is φ = 17269959168.

The previous prime is 18148997981. The next prime is 18148998001. The reversal of 18148997987 is 78979984181.

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 18148997987 - 2²² = 18144803683 is a prime.

It is a super-2 number, since 2×18148997987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18148997987.

It is not an unprimeable number, because it can be changed into a prime (18148997981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2039828 + ... + 2048705.

It is an arithmetic number, because the mean of its divisors is an integer number (2379526788).

Almost surely, 2^18148997987 is an apocalyptic number.

18148997987 is a deficient number, since it is larger than the sum of its proper divisors (887216317).

18148997987 is a wasteful number, since it uses less digits than its factorization.

18148997987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088749.

The product of its digits is 73156608, while the sum is 71.

The spelling of 18148997987 in words is "eighteen billion, one hundred forty-eight million, nine hundred ninety-seven thousand, nine hundred eighty-seven".