66477885 has 16 divisors (see below), whose sum is σ = 106920384. Its totient is φ = 35269632.

The previous prime is 66477877. The next prime is 66477893. The reversal of 66477885 is 58877466.

It is an interprime number because it is at equal distance from previous prime (66477877) and next prime (66477893).

It is not a de Polignac number, because 66477885 - 2³ = 66477877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8587 + ... + 14376.

It is an arithmetic number, because the mean of its divisors is an integer number (6682524).

Almost surely, 2^66477885 is an apocalyptic number.

It is an amenable number.

66477885 is a deficient number, since it is larger than the sum of its proper divisors (40442499).

66477885 is a wasteful number, since it uses less digits than its factorization.

66477885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23164.

The product of its digits is 2257920, while the sum is 51.

The square root of 66477885 is about 8153.3971447489. The cubic root of 66477885 is about 405.0970351245.

The spelling of 66477885 in words is "sixty-six million, four hundred seventy-seven thousand, eight hundred eighty-five".