66161345 has 4 divisors (see below), whose sum is σ = 79393620. Its totient is φ = 52929072.

The previous prime is 66161339. The next prime is 66161351. The reversal of 66161345 is 54316166.

66161345 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.

It is an interprime number because it is at equal distance from previous prime (66161339) and next prime (66161351).

It can be written as a sum of positive squares in 2 ways, for example, as 50865424 + 15295921 = 7132^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 66161345 - 2⁶ = 66161281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6616130 + ... + 6616139.

It is an arithmetic number, because the mean of its divisors is an integer number (19848405).

Almost surely, 2^66161345 is an apocalyptic number.

It is an amenable number.

66161345 is a deficient number, since it is larger than the sum of its proper divisors (13232275).

66161345 is a wasteful number, since it uses less digits than its factorization.

66161345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232274.

The product of its digits is 12960, while the sum is 32.

The square root of 66161345 is about 8133.9624415164. The cubic root of 66161345 is about 404.4530441159.

The spelling of 66161345 in words is "sixty-six million, one hundred sixty-one thousand, three hundred forty-five".