66749017 has 4 divisors (see below), whose sum is σ = 67689216. Its totient is φ = 65808820.

The previous prime is 66749009. The next prime is 66749027. The reversal of 66749017 is 71094766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71094766 = 2 ⋅35547383.

It is a cyclic number.

It is not a de Polignac number, because 66749017 - 2³ = 66749009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66749027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469993 + ... + 470134.

It is an arithmetic number, because the mean of its divisors is an integer number (16922304).

Almost surely, 2^66749017 is an apocalyptic number.

It is an amenable number.

66749017 is a deficient number, since it is larger than the sum of its proper divisors (940199).

66749017 is an equidigital number, since it uses as much as digits as its factorization.

66749017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940198.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 66749017 is about 8170.0071603396. The cubic root of 66749017 is about 405.6470214611.

The spelling of 66749017 in words is "sixty-six million, seven hundred forty-nine thousand, seventeen".