166256263861 has 4 divisors (see below), whose sum is σ = 166372772832. Its totient is φ = 166139754892.

The previous prime is 166256263847. The next prime is 166256263909. The reversal of 166256263861 is 168362652661.

166256263861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166256263861 - 2⁵ = 166256263829 is a prime.

It is a super-2 number, since 2×166256263861² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166256263799 and 166256263808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166256263841) 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, 58252345 + ... + 58255198.

It is an arithmetic number, because the mean of its divisors is an integer number (41593193208).

Almost surely, 2^166256263861 is an apocalyptic number.

It is an amenable number.

166256263861 is a deficient number, since it is larger than the sum of its proper divisors (116508971).

166256263861 is a wasteful number, since it uses less digits than its factorization.

166256263861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116508970.

The product of its digits is 3732480, while the sum is 52.

The spelling of 166256263861 in words is "one hundred sixty-six billion, two hundred fifty-six million, two hundred sixty-three thousand, eight hundred sixty-one".