117727601561 has 4 divisors (see below), whose sum is σ = 124652754612. Its totient is φ = 110802448512.

The previous prime is 117727601549. The next prime is 117727601581. The reversal of 117727601561 is 165106727711.

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 43209521161 + 74518080400 = 207869^2 + 272980^2 .

It is a cyclic number.

It is not a de Polignac number, because 117727601561 - 2³⁴ = 100547732377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117727601501) 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, 3462576500 + ... + 3462576533.

It is an arithmetic number, because the mean of its divisors is an integer number (31163188653).

Almost surely, 2^117727601561 is an apocalyptic number.

It is an amenable number.

117727601561 is a deficient number, since it is larger than the sum of its proper divisors (6925153051).

117727601561 is an equidigital number, since it uses as much as digits as its factorization.

117727601561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925153050.

The product of its (nonzero) digits is 123480, while the sum is 44.

The spelling of 117727601561 in words is "one hundred seventeen billion, seven hundred twenty-seven million, six hundred one thousand, five hundred sixty-one".