66755767 has 16 divisors (see below), whose sum is σ = 75075840. Its totient is φ = 58931712.

The previous prime is 66755707. The next prime is 66755783. The reversal of 66755767 is 76755766.

It is not a de Polignac number, because 66755767 - 2¹⁹ = 66231479 is a prime.

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 66755767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66755707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41818 + ... + 43384.

It is an arithmetic number, because the mean of its divisors is an integer number (4692240).

Almost surely, 2^66755767 is an apocalyptic number.

66755767 is a deficient number, since it is larger than the sum of its proper divisors (8320073).

66755767 is a wasteful number, since it uses less digits than its factorization.

66755767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its digits is 1852200, while the sum is 49.

The square root of 66755767 is about 8170.4202462297. The cubic root of 66755767 is about 405.6606946967.

Subtracting 66755767 from its reverse (76755766), we obtain a palindrome (9999999).

The spelling of 66755767 in words is "sixty-six million, seven hundred fifty-five thousand, seven hundred sixty-seven".