66974091 has 16 divisors (see below), whose sum is σ = 95352576. Its totient is φ = 41713056.

The previous prime is 66974077. The next prime is 66974093. The reversal of 66974091 is 19047966.

It is not a de Polignac number, because 66974091 - 2⁵ = 66974059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66974093) 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, 8320 + ... + 14253.

It is an arithmetic number, because the mean of its divisors is an integer number (5959536).

Almost surely, 2^66974091 is an apocalyptic number.

66974091 is a deficient number, since it is larger than the sum of its proper divisors (28378485).

66974091 is a wasteful number, since it uses less digits than its factorization.

66974091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22642.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 66974091 is about 8183.7699747732. The cubic root of 66974091 is about 406.1024497376.

The spelling of 66974091 in words is "sixty-six million, nine hundred seventy-four thousand, ninety-one".