18486620771 has 4 divisors (see below), whose sum is σ = 18762540552. Its totient is φ = 18210700992.

The previous prime is 18486620729. The next prime is 18486620819. The reversal of 18486620771 is 17702668481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18486620771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18486620701) 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, 137959790 + ... + 137959923.

It is an arithmetic number, because the mean of its divisors is an integer number (4690635138).

Almost surely, 2^18486620771 is an apocalyptic number.

18486620771 is a deficient number, since it is larger than the sum of its proper divisors (275919781).

18486620771 is an equidigital number, since it uses as much as digits as its factorization.

18486620771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275919780.

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 18486620771 in words is "eighteen billion, four hundred eighty-six million, six hundred twenty thousand, seven hundred seventy-one".