11899697517 has 24 divisors (see below), whose sum is σ = 17267852160. Its totient is φ = 7896575040.

The previous prime is 11899697507. The next prime is 11899697527. The reversal of 11899697517 is 71579699811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11899697507) and next prime (11899697527).

It is not a de Polignac number, because 11899697517 - 2⁴ = 11899697501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11899697507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1808209 + ... + 1814777.

It is an arithmetic number, because the mean of its divisors is an integer number (719493840).

Almost surely, 2^11899697517 is an apocalyptic number.

It is an amenable number.

11899697517 is a deficient number, since it is larger than the sum of its proper divisors (5368154643).

11899697517 is a wasteful number, since it uses less digits than its factorization.

11899697517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7473 (or 7470 counting only the distinct ones).

The product of its digits is 8573040, while the sum is 63.

The spelling of 11899697517 in words is "eleven billion, eight hundred ninety-nine million, six hundred ninety-seven thousand, five hundred seventeen".