66517701 has 4 divisors (see below), whose sum is σ = 88690272. Its totient is φ = 44345132.

The previous prime is 66517663. The next prime is 66517729. The reversal of 66517701 is 10771566.

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.

It is a cyclic number.

It is not a de Polignac number, because 66517701 - 2¹⁸ = 66255557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66517751) 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, 11086281 + ... + 11086286.

It is an arithmetic number, because the mean of its divisors is an integer number (22172568).

Almost surely, 2^66517701 is an apocalyptic number.

It is an amenable number.

66517701 is a deficient number, since it is larger than the sum of its proper divisors (22172571).

66517701 is a wasteful number, since it uses less digits than its factorization.

66517701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22172570.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 66517701 is about 8155.8384608819. The cubic root of 66517701 is about 405.1778947190.

The spelling of 66517701 in words is "sixty-six million, five hundred seventeen thousand, seven hundred one".