66911761 has 16 divisors (see below), whose sum is σ = 80999424. Its totient is φ = 54031824.

The previous prime is 66911753. The next prime is 66911771. The reversal of 66911761 is 16711966.

It is not a de Polignac number, because 66911761 - 2³ = 66911753 is a prime.

It is a super-2 number, since 2×66911761² = 8954367520242242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66911761.

It is not an unprimeable number, because it can be changed into a prime (66911771) 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 15 ways as a sum of consecutive naturals, for example, 7686 + ... + 13888.

It is an arithmetic number, because the mean of its divisors is an integer number (5062464).

Almost surely, 2^66911761 is an apocalyptic number.

It is an amenable number.

66911761 is a deficient number, since it is larger than the sum of its proper divisors (14087663).

66911761 is a wasteful number, since it uses less digits than its factorization.

66911761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6300.

The product of its digits is 13608, while the sum is 37.

The square root of 66911761 is about 8179.9609412270. The cubic root of 66911761 is about 405.9764297511.

The spelling of 66911761 in words is "sixty-six million, nine hundred eleven thousand, seven hundred sixty-one".