18736366641 has 4 divisors (see below), whose sum is σ = 24981822192. Its totient is φ = 12490911092.

The previous prime is 18736366639. The next prime is 18736366657. The reversal of 18736366641 is 14666363781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18736366641 - 2¹ = 18736366639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18736366601) 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, 3122727771 + ... + 3122727776.

It is an arithmetic number, because the mean of its divisors is an integer number (6245455548).

Almost surely, 2^18736366641 is an apocalyptic number.

It is an amenable number.

18736366641 is a deficient number, since it is larger than the sum of its proper divisors (6245455551).

18736366641 is an equidigital number, since it uses as much as digits as its factorization.

18736366641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6245455550.

The product of its digits is 2612736, while the sum is 51.

The spelling of 18736366641 in words is "eighteen billion, seven hundred thirty-six million, three hundred sixty-six thousand, six hundred forty-one".