66977055 has 12 divisors (see below), whose sum is σ = 116093640. Its totient is φ = 35721072.

The previous prime is 66977051. The next prime is 66977063. The reversal of 66977055 is 55077966.

It is a happy number.

It is not a de Polignac number, because 66977055 - 2² = 66977051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1488379 = 66977055 / (6 + 6 + 9 + 7 + 7 + 0 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 66977055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66977051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 744145 + ... + 744234.

It is an arithmetic number, because the mean of its divisors is an integer number (9674470).

Almost surely, 2^66977055 is an apocalyptic number.

66977055 is a deficient number, since it is larger than the sum of its proper divisors (49116585).

66977055 is a wasteful number, since it uses less digits than its factorization.

66977055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488390 (or 1488387 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 66977055 is about 8183.9510629035. The cubic root of 66977055 is about 406.1084404617.

The spelling of 66977055 in words is "sixty-six million, nine hundred seventy-seven thousand, fifty-five".