18061661963 has 4 divisors (see below), whose sum is σ = 18061965600. Its totient is φ = 18061358328.

The previous prime is 18061661957. The next prime is 18061661977. The reversal of 18061661963 is 36916616081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36916616081 = 83 ⋅444778507.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18061661963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18061661903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30020 + ... + 192417.

It is an arithmetic number, because the mean of its divisors is an integer number (4515491400).

Almost surely, 2^18061661963 is an apocalyptic number.

18061661963 is a deficient number, since it is larger than the sum of its proper divisors (303637).

18061661963 is an equidigital number, since it uses as much as digits as its factorization.

18061661963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303636.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 18061661963 in words is "eighteen billion, sixty-one million, six hundred sixty-one thousand, nine hundred sixty-three".