18741057497 has 2 divisors, whose sum is σ = 18741057498. Its totient is φ = 18741057496.

The previous prime is 18741057437. The next prime is 18741057529. The reversal of 18741057497 is 79475014781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18297702361 + 443355136 = 135269^2 + 21056^2 .

It is an emirp because it is prime and its reverse (79475014781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18741057497 is a prime.

It is a super-2 number, since 2×18741057497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18741057437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370528748 + 9370528749.

It is an arithmetic number, because the mean of its divisors is an integer number (9370528749).

Almost surely, 2^18741057497 is an apocalyptic number.

It is an amenable number.

18741057497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18741057497 is an equidigital number, since it uses as much as digits as its factorization.

18741057497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1975680, while the sum is 53.

The spelling of 18741057497 in words is "eighteen billion, seven hundred forty-one million, fifty-seven thousand, four hundred ninety-seven".