66720695 has 8 divisors (see below), whose sum is σ = 80641680. Its totient is φ = 52992000.

The previous prime is 66720659. The next prime is 66720697. The reversal of 66720695 is 59602766.

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

It is not a de Polignac number, because 66720695 - 2⁸ = 66720439 is a prime.

It is a super-2 number, since 2×66720695² = 8903302282566050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66720697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47306 + ... + 48695.

It is an arithmetic number, because the mean of its divisors is an integer number (10080210).

Almost surely, 2^66720695 is an apocalyptic number.

66720695 is a deficient number, since it is larger than the sum of its proper divisors (13920985).

66720695 is a wasteful number, since it uses less digits than its factorization.

66720695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96145.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 66720695 is about 8168.2736854246. The cubic root of 66720695 is about 405.5896405400.

The spelling of 66720695 in words is "sixty-six million, seven hundred twenty thousand, six hundred ninety-five".