111818537497 has 2 divisors, whose sum is σ = 111818537498. Its totient is φ = 111818537496.

The previous prime is 111818537483. The next prime is 111818537503. The reversal of 111818537497 is 794735818111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98785118601 + 13033418896 = 314301^2 + 114164^2 .

It is a cyclic number.

It is not a de Polignac number, because 111818537497 - 2¹¹ = 111818535449 is a prime.

It is not a weakly prime, because it can be changed into another prime (111818537407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55909268748 + 55909268749.

It is an arithmetic number, because the mean of its divisors is an integer number (55909268749).

Almost surely, 2^111818537497 is an apocalyptic number.

It is an amenable number.

111818537497 is a deficient number, since it is larger than the sum of its proper divisors (1).

111818537497 is an equidigital number, since it uses as much as digits as its factorization.

111818537497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 55.

The spelling of 111818537497 in words is "one hundred eleven billion, eight hundred eighteen million, five hundred thirty-seven thousand, four hundred ninety-seven".