191660864 has 14 divisors (see below), whose sum is σ = 380327154. Its totient is φ = 95830400.

The previous prime is 191660837. The next prime is 191660869. The reversal of 191660864 is 468066191.

It can be written as a sum of positive squares in only one way, i.e., 190660864 + 1000000 = 13808^2 + 1000^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191660869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1497287 + ... + 1497414.

Almost surely, 2^191660864 is an apocalyptic number.

It is an amenable number.

191660864 is a deficient number, since it is larger than the sum of its proper divisors (188666290).

191660864 is an equidigital number, since it uses as much as digits as its factorization.

191660864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2994713 (or 2994703 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 191660864 is about 13844.1635355842. The cubic root of 191660864 is about 576.5599621400.

The spelling of 191660864 in words is "one hundred ninety-one million, six hundred sixty thousand, eight hundred sixty-four".