18649722037 has 2 divisors, whose sum is σ = 18649722038. Its totient is φ = 18649722036.

The previous prime is 18649722019. The next prime is 18649722053. The reversal of 18649722037 is 73022794681.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10556740516 + 8092981521 = 102746^2 + 89961^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649722037 - 2¹¹ = 18649719989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18649722067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9324861018 + 9324861019.

It is an arithmetic number, because the mean of its divisors is an integer number (9324861019).

Almost surely, 2^18649722037 is an apocalyptic number.

It is an amenable number.

18649722037 is a deficient number, since it is larger than the sum of its proper divisors (1).

18649722037 is an equidigital number, since it uses as much as digits as its factorization.

18649722037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 18649722037 in words is "eighteen billion, six hundred forty-nine million, seven hundred twenty-two thousand, thirty-seven".