115661267999 has 4 divisors (see below), whose sum is σ = 117054777336. Its totient is φ = 114267758664.

The previous prime is 115661267951. The next prime is 115661268013. The reversal of 115661267999 is 999762166511.

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

It is a cyclic number.

It is not a de Polignac number, because 115661267999 - 2¹⁶ = 115661202463 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 (115661267599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696754544 + ... + 696754709.

It is an arithmetic number, because the mean of its divisors is an integer number (29263694334).

Almost surely, 2^115661267999 is an apocalyptic number.

115661267999 is a deficient number, since it is larger than the sum of its proper divisors (1393509337).

115661267999 is an equidigital number, since it uses as much as digits as its factorization.

115661267999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393509336.

The product of its digits is 11022480, while the sum is 62.

The spelling of 115661267999 in words is "one hundred fifteen billion, six hundred sixty-one million, two hundred sixty-seven thousand, nine hundred ninety-nine".