191668945 has 16 divisors (see below), whose sum is σ = 248063760. Its totient is φ = 141329664.

The previous prime is 191668943. The next prime is 191668951. The reversal of 191668945 is 549866191.

191668945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 35093776 + 156575169 = 5924^2 + 12513^2 .

It is a cyclic number.

It is not a de Polignac number, because 191668945 - 2¹ = 191668943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191668943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52107 + ... + 55663.

It is an arithmetic number, because the mean of its divisors is an integer number (15503985).

Almost surely, 2^191668945 is an apocalyptic number.

It is an amenable number.

191668945 is a deficient number, since it is larger than the sum of its proper divisors (56394815).

191668945 is a wasteful number, since it uses less digits than its factorization.

191668945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404.

The product of its digits is 466560, while the sum is 49.

The square root of 191668945 is about 13844.4553883495. The cubic root of 191668945 is about 576.5680651950.

The spelling of 191668945 in words is "one hundred ninety-one million, six hundred sixty-eight thousand, nine hundred forty-five".