191216667 has 8 divisors (see below), whose sum is σ = 255062080. Its totient is φ = 127424520.

The previous prime is 191216659. The next prime is 191216681. The reversal of 191216667 is 766612191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 191216667 - 2³ = 191216659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191216567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4009 + ... + 19962.

It is an arithmetic number, because the mean of its divisors is an integer number (31882760).

Almost surely, 2^191216667 is an apocalyptic number.

191216667 is a deficient number, since it is larger than the sum of its proper divisors (63845413).

191216667 is a wasteful number, since it uses less digits than its factorization.

191216667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26633.

The product of its digits is 27216, while the sum is 39.

The square root of 191216667 is about 13828.1114762646. Note that the first 3 decimals coincide. The cubic root of 191216667 is about 576.1142020136.

The spelling of 191216667 in words is "one hundred ninety-one million, two hundred sixteen thousand, six hundred sixty-seven".