18910757497 has 2 divisors, whose sum is σ = 18910757498. Its totient is φ = 18910757496.

The previous prime is 18910757491. The next prime is 18910757531. The reversal of 18910757497 is 79475701981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17630262841 + 1280494656 = 132779^2 + 35784^2 .

It is a cyclic number.

It is not a de Polignac number, because 18910757497 - 2¹¹ = 18910755449 is a prime.

It is a super-2 number, since 2×18910757497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18910757491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9455378748 + 9455378749.

It is an arithmetic number, because the mean of its divisors is an integer number (9455378749).

Almost surely, 2^18910757497 is an apocalyptic number.

It is an amenable number.

18910757497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18910757497 is an equidigital number, since it uses as much as digits as its factorization.

18910757497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 58.

The spelling of 18910757497 in words is "eighteen billion, nine hundred ten million, seven hundred fifty-seven thousand, four hundred ninety-seven".