18735720373 has 2 divisors, whose sum is σ = 18735720374. Its totient is φ = 18735720372.

The previous prime is 18735720347. The next prime is 18735720379. The reversal of 18735720373 is 37302753781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18694272529 + 41447844 = 136727^2 + 6438^2 .

It is a cyclic number.

It is not a de Polignac number, because 18735720373 - 2²¹ = 18733623221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18735720379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367860186 + 9367860187.

It is an arithmetic number, because the mean of its divisors is an integer number (9367860187).

Almost surely, 2^18735720373 is an apocalyptic number.

It is an amenable number.

18735720373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18735720373 is an equidigital number, since it uses as much as digits as its factorization.

18735720373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 740880, while the sum is 46.

The spelling of 18735720373 in words is "eighteen billion, seven hundred thirty-five million, seven hundred twenty thousand, three hundred seventy-three".