66994147 has 24 divisors (see below), whose sum is σ = 79233840. Its totient is φ = 56105280.

The previous prime is 66994111. The next prime is 66994163. The reversal of 66994147 is 74149966.

It is not a de Polignac number, because 66994147 - 2²³ = 58605539 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 66994097 and 66994106.

It is not an unprimeable number, because it can be changed into a prime (66994177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168553 + ... + 168949.

It is an arithmetic number, because the mean of its divisors is an integer number (3301410).

Almost surely, 2^66994147 is an apocalyptic number.

66994147 is a deficient number, since it is larger than the sum of its proper divisors (12239693).

66994147 is a wasteful number, since it uses less digits than its factorization.

66994147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 460 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 66994147 is about 8184.9952351849. The cubic root of 66994147 is about 406.1429827146.

The spelling of 66994147 in words is "sixty-six million, nine hundred ninety-four thousand, one hundred forty-seven".