11781337597 has 2 divisors, whose sum is σ = 11781337598. Its totient is φ = 11781337596.

The previous prime is 11781337571. The next prime is 11781337693. The reversal of 11781337597 is 79573318711.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11413503556 + 367834041 = 106834^2 + 19179^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781337597 - 2³¹ = 9633853949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11781337507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5890668798 + 5890668799.

It is an arithmetic number, because the mean of its divisors is an integer number (5890668799).

Almost surely, 2^11781337597 is an apocalyptic number.

It is an amenable number.

11781337597 is a deficient number, since it is larger than the sum of its proper divisors (1).

11781337597 is an equidigital number, since it uses as much as digits as its factorization.

11781337597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 52.

The spelling of 11781337597 in words is "eleven billion, seven hundred eighty-one million, three hundred thirty-seven thousand, five hundred ninety-seven".