66311705 has 8 divisors (see below), whose sum is σ = 80109000. Its totient is φ = 52692736.

The previous prime is 66311701. The next prime is 66311723. The reversal of 66311705 is 50711366.

It can be written as a sum of positive squares in 4 ways, for example, as 1364224 + 64947481 = 1168^2 + 8059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66311705 - 2² = 66311701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66311701) 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, 43760 + ... + 45249.

It is an arithmetic number, because the mean of its divisors is an integer number (10013625).

Almost surely, 2^66311705 is an apocalyptic number.

It is an amenable number.

66311705 is a deficient number, since it is larger than the sum of its proper divisors (13797295).

66311705 is a wasteful number, since it uses less digits than its factorization.

66311705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89163.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66311705 is about 8143.1999238629. The cubic root of 66311705 is about 404.7592024876.

The spelling of 66311705 in words is "sixty-six million, three hundred eleven thousand, seven hundred five".