66172007 has 16 divisors (see below), whose sum is σ = 77700384. Its totient is φ = 55680000.

The previous prime is 66171983. The next prime is 66172013. The reversal of 66172007 is 70027166.

It is a cyclic number.

It is not a de Polignac number, because 66172007 - 2¹⁴ = 66155623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172027) 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, 8507 + ... + 14307.

It is an arithmetic number, because the mean of its divisors is an integer number (4856274).

Almost surely, 2^66172007 is an apocalyptic number.

66172007 is a deficient number, since it is larger than the sum of its proper divisors (11528377).

66172007 is a wasteful number, since it uses less digits than its factorization.

66172007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 66172007 is about 8134.6178152388. The cubic root of 66172007 is about 404.4747690205.

The spelling of 66172007 in words is "sixty-six million, one hundred seventy-two thousand, seven".