66403017 has 8 divisors (see below), whose sum is σ = 98374880. Its totient is φ = 44268660.

The previous prime is 66403009. The next prime is 66403021. The reversal of 66403017 is 71030466.

66403017 is a `hidden beast` number, since 6 + 640 + 3 + 0 + 17 = 666.

It is not a de Polignac number, because 66403017 - 2³ = 66403009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2459371 = 66403017 / (6 + 6 + 4 + 0 + 3 + 0 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66403217) 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, 1229659 + ... + 1229712.

It is an arithmetic number, because the mean of its divisors is an integer number (12296860).

Almost surely, 2^66403017 is an apocalyptic number.

It is an amenable number.

66403017 is a deficient number, since it is larger than the sum of its proper divisors (31971863).

66403017 is a wasteful number, since it uses less digits than its factorization.

66403017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459380 (or 2459374 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 66403017 is about 8148.8046362641. The cubic root of 66403017 is about 404.9449033417.

The spelling of 66403017 in words is "sixty-six million, four hundred three thousand, seventeen".