166070391 has 8 divisors (see below), whose sum is σ = 221545344. Its totient is φ = 110654520.

The previous prime is 166070369. The next prime is 166070423. The reversal of 166070391 is 193070661.

166070391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 166070391 - 2¹³ = 166062199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166070321) 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, 7731 + ... + 19796.

It is an arithmetic number, because the mean of its divisors is an integer number (27693168).

Almost surely, 2^166070391 is an apocalyptic number.

166070391 is a deficient number, since it is larger than the sum of its proper divisors (55474953).

166070391 is a wasteful number, since it uses less digits than its factorization.

166070391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29541.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 166070391 is about 12886.8301377802. The cubic root of 166070391 is about 549.6641376442.

The spelling of 166070391 in words is "one hundred sixty-six million, seventy thousand, three hundred ninety-one".