18078002661 has 16 divisors (see below), whose sum is σ = 24218865216. Its totient is φ = 11994692736.

The previous prime is 18078002653. The next prime is 18078002689. The reversal of 18078002661 is 16620087081.

It is not a de Polignac number, because 18078002661 - 2³ = 18078002653 is a prime.

It is a super-2 number, since 2×18078002661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18078002641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598426 + ... + 627908.

It is an arithmetic number, because the mean of its divisors is an integer number (1513679076).

Almost surely, 2^18078002661 is an apocalyptic number.

It is an amenable number.

18078002661 is a deficient number, since it is larger than the sum of its proper divisors (6140862555).

18078002661 is a wasteful number, since it uses less digits than its factorization.

18078002661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30452.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 18078002661 in words is "eighteen billion, seventy-eight million, two thousand, six hundred sixty-one".