18650161391 has 4 divisors (see below), whose sum is σ = 18672659400. Its totient is φ = 18627663384.

The previous prime is 18650161367. The next prime is 18650161393. The reversal of 18650161391 is 19316105681.

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

It is a cyclic number.

It is not a de Polignac number, because 18650161391 - 2³⁴ = 1470292207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18650161393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11247761 + ... + 11249418.

It is an arithmetic number, because the mean of its divisors is an integer number (4668164850).

Almost surely, 2^18650161391 is an apocalyptic number.

18650161391 is a deficient number, since it is larger than the sum of its proper divisors (22498009).

18650161391 is an equidigital number, since it uses as much as digits as its factorization.

18650161391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22498008.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 18650161391 in words is "eighteen billion, six hundred fifty million, one hundred sixty-one thousand, three hundred ninety-one".