18398070681 has 16 divisors (see below), whose sum is σ = 25346580480. Its totient is φ = 11858236560.

The previous prime is 18398070679. The next prime is 18398070689. The reversal of 18398070681 is 18607089381.

It is not a de Polignac number, because 18398070681 - 2¹ = 18398070679 is a prime.

It is a super-2 number, since 2×18398070681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18398070689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426 + ... + 191828.

It is an arithmetic number, because the mean of its divisors is an integer number (1584161280).

Almost surely, 2^18398070681 is an apocalyptic number.

It is an amenable number.

18398070681 is a deficient number, since it is larger than the sum of its proper divisors (6948509799).

18398070681 is a wasteful number, since it uses less digits than its factorization.

18398070681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191476.

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 18398070681 in words is "eighteen billion, three hundred ninety-eight million, seventy thousand, six hundred eighty-one".