18349143985 has 8 divisors (see below), whose sum is σ = 22021090560. Its totient is φ = 14677903344.

The previous prime is 18349143983. The next prime is 18349144031. The reversal of 18349143985 is 58934194381.

It is a happy number.

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 18349143985 - 2¹ = 18349143983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18349143983) 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, 117505 + ... + 224734.

It is an arithmetic number, because the mean of its divisors is an integer number (2752636320).

Almost surely, 2^18349143985 is an apocalyptic number.

It is an amenable number.

18349143985 is a deficient number, since it is larger than the sum of its proper divisors (3671946575).

18349143985 is a wasteful number, since it uses less digits than its factorization.

18349143985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352967.

The product of its digits is 3732480, while the sum is 55.

The spelling of 18349143985 in words is "eighteen billion, three hundred forty-nine million, one hundred forty-three thousand, nine hundred eighty-five".