116921895781 has 4 divisors (see below), whose sum is σ = 116977284864. Its totient is φ = 116866506700.

The previous prime is 116921895751. The next prime is 116921895799. The reversal of 116921895781 is 187598129611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116921895781 - 2⁹ = 116921895269 is a prime.

It is a super-2 number, since 2×116921895781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116921895751) 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 3 ways as a sum of consecutive naturals, for example, 27691375 + ... + 27695596.

It is an arithmetic number, because the mean of its divisors is an integer number (29244321216).

Almost surely, 2^116921895781 is an apocalyptic number.

It is an amenable number.

116921895781 is a deficient number, since it is larger than the sum of its proper divisors (55389083).

116921895781 is an equidigital number, since it uses as much as digits as its factorization.

116921895781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55389082.

The product of its digits is 2177280, while the sum is 58.

The spelling of 116921895781 in words is "one hundred sixteen billion, nine hundred twenty-one million, eight hundred ninety-five thousand, seven hundred eighty-one".