11918863597 has 4 divisors (see below), whose sum is σ = 12024340380. Its totient is φ = 11813386816.

The previous prime is 11918863553. The next prime is 11918863633. The reversal of 11918863597 is 79536881911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2040690276 + 9878173321 = 45174^2 + 99389^2 .

It is a cyclic number.

It is not a de Polignac number, because 11918863597 - 2¹⁵ = 11918830829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11918869597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52738222 + ... + 52738447.

It is an arithmetic number, because the mean of its divisors is an integer number (3006085095).

Almost surely, 2^11918863597 is an apocalyptic number.

It is an amenable number.

11918863597 is a deficient number, since it is larger than the sum of its proper divisors (105476783).

11918863597 is a wasteful number, since it uses less digits than its factorization.

11918863597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105476782.

The product of its digits is 3265920, while the sum is 58.

The spelling of 11918863597 in words is "eleven billion, nine hundred eighteen million, eight hundred sixty-three thousand, five hundred ninety-seven".