66916755 has 24 divisors (see below), whose sum is σ = 119733120. Its totient is φ = 34536960.

The previous prime is 66916753. The next prime is 66916769. The reversal of 66916755 is 55761966.

It is not a de Polignac number, because 66916755 - 2¹ = 66916753 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66916755.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66916753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22590 + ... + 25379.

It is an arithmetic number, because the mean of its divisors is an integer number (4988880).

Almost surely, 2^66916755 is an apocalyptic number.

66916755 is a deficient number, since it is larger than the sum of its proper divisors (52816365).

66916755 is a wasteful number, since it uses less digits than its factorization.

66916755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48011 (or 48008 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 66916755 is about 8180.2661937128. The cubic root of 66916755 is about 405.9865295991.

It can be divided in two parts, 669 and 16755, that added together give a square (17424 = 132²).

The spelling of 66916755 in words is "sixty-six million, nine hundred sixteen thousand, seven hundred fifty-five".