118636163391 has 4 divisors (see below), whose sum is σ = 158181551192. Its totient is φ = 79090775592.

The previous prime is 118636163377. The next prime is 118636163473. The reversal of 118636163391 is 193361636811.

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

It is not a de Polignac number, because 118636163391 - 2²² = 118631969087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118636163391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118636163291) 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, 19772693896 + ... + 19772693901.

It is an arithmetic number, because the mean of its divisors is an integer number (39545387798).

Almost surely, 2^118636163391 is an apocalyptic number.

118636163391 is a deficient number, since it is larger than the sum of its proper divisors (39545387801).

118636163391 is an equidigital number, since it uses as much as digits as its factorization.

118636163391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39545387800.

The product of its digits is 419904, while the sum is 48.

The spelling of 118636163391 in words is "one hundred eighteen billion, six hundred thirty-six million, one hundred sixty-three thousand, three hundred ninety-one".