18751741961 has 2 divisors, whose sum is σ = 18751741962. Its totient is φ = 18751741960.

The previous prime is 18751741913. The next prime is 18751741963. The reversal of 18751741961 is 16914715781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10515271936 + 8236470025 = 102544^2 + 90755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18751741961 is a prime.

Together with 18751741963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18751741963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375870980 + 9375870981.

It is an arithmetic number, because the mean of its divisors is an integer number (9375870981).

Almost surely, 2^18751741961 is an apocalyptic number.

It is an amenable number.

18751741961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751741961 is an equidigital number, since it uses as much as digits as its factorization.

18751741961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 50.

The spelling of 18751741961 in words is "eighteen billion, seven hundred fifty-one million, seven hundred forty-one thousand, nine hundred sixty-one".