166881313 has 4 divisors (see below), whose sum is σ = 175664560. Its totient is φ = 158098068.

The previous prime is 166881301. The next prime is 166881317. The reversal of 166881313 is 313188661.

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 166881313 - 2¹³ = 166873121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166881317) 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, 4391595 + ... + 4391632.

It is an arithmetic number, because the mean of its divisors is an integer number (43916140).

Almost surely, 2^166881313 is an apocalyptic number.

It is an amenable number.

166881313 is a deficient number, since it is larger than the sum of its proper divisors (8783247).

166881313 is an equidigital number, since it uses as much as digits as its factorization.

166881313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8783246.

The product of its digits is 20736, while the sum is 37.

The square root of 166881313 is about 12918.2550292212. The cubic root of 166881313 is about 550.5573556607.

The spelling of 166881313 in words is "one hundred sixty-six million, eight hundred eighty-one thousand, three hundred thirteen".