66911701 has 4 divisors (see below), whose sum is σ = 67537152. Its totient is φ = 66286252.

The previous prime is 66911699. The next prime is 66911737. The reversal of 66911701 is 10711966.

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 66911701 - 2¹ = 66911699 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66911771) 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, 312565 + ... + 312778.

It is an arithmetic number, because the mean of its divisors is an integer number (16884288).

Almost surely, 2^66911701 is an apocalyptic number.

It is an amenable number.

66911701 is a deficient number, since it is larger than the sum of its proper divisors (625451).

66911701 is a wasteful number, since it uses less digits than its factorization.

66911701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625450.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 66911701 is about 8179.9572737270. The cubic root of 66911701 is about 405.9763084042.

The spelling of 66911701 in words is "sixty-six million, nine hundred eleven thousand, seven hundred one".