66212755 has 16 divisors (see below), whose sum is σ = 92297664. Its totient is φ = 44657280.

The previous prime is 66212753. The next prime is 66212759. The reversal of 66212755 is 55721266.

It is not a de Polignac number, because 66212755 - 2¹ = 66212753 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 66212755.

It is not an unprimeable number, because it can be changed into a prime (66212753) 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, 13372 + ... + 17641.

It is an arithmetic number, because the mean of its divisors is an integer number (5768604).

Almost surely, 2^66212755 is an apocalyptic number.

66212755 is a deficient number, since it is larger than the sum of its proper divisors (26084909).

66212755 is a wasteful number, since it uses less digits than its factorization.

66212755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31086.

The product of its digits is 25200, while the sum is 34.

The square root of 66212755 is about 8137.1220342330. The cubic root of 66212755 is about 404.5577757014.

The spelling of 66212755 in words is "sixty-six million, two hundred twelve thousand, seven hundred fifty-five".