66613617 has 32 divisors (see below), whose sum is σ = 115200000. Its totient is φ = 37250064.

The previous prime is 66613583. The next prime is 66613619. The reversal of 66613617 is 71631666.

It is not a de Polignac number, because 66613617 - 2¹¹ = 66611569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66613619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5134 + ... + 12632.

It is an arithmetic number, because the mean of its divisors is an integer number (3600000).

Almost surely, 2^66613617 is an apocalyptic number.

It is an amenable number.

66613617 is a deficient number, since it is larger than the sum of its proper divisors (48586383).

66613617 is a wasteful number, since it uses less digits than its factorization.

66613617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7562 (or 7556 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66613617 is about 8161.7165473937. The cubic root of 66613617 is about 405.3725515679.

The spelling of 66613617 in words is "sixty-six million, six hundred thirteen thousand, six hundred seventeen".