66195705 has 32 divisors (see below), whose sum is σ = 114770304. Its totient is φ = 32449536.

The previous prime is 66195691. The next prime is 66195709. The reversal of 66195705 is 50759166.

It is not a de Polignac number, because 66195705 - 2⁶ = 66195641 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66195709) 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, 7947 + ... + 13983.

It is an arithmetic number, because the mean of its divisors is an integer number (3586572).

Almost surely, 2^66195705 is an apocalyptic number.

It is an amenable number.

66195705 is a deficient number, since it is larger than the sum of its proper divisors (48574599).

66195705 is a wasteful number, since it uses less digits than its factorization.

66195705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105.

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 66195705 is about 8136.0742990708. The cubic root of 66195705 is about 404.5230477389.

The spelling of 66195705 in words is "sixty-six million, one hundred ninety-five thousand, seven hundred five".