66553711 has 12 divisors (see below), whose sum is σ = 78735240. Its totient is φ = 56076720.

The previous prime is 66553709. The next prime is 66553733. The reversal of 66553711 is 11735566.

It is not a de Polignac number, because 66553711 - 2¹ = 66553709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66553511) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8620 + ... + 14401.

It is an arithmetic number, because the mean of its divisors is an integer number (6561270).

Almost surely, 2^66553711 is an apocalyptic number.

66553711 is a deficient number, since it is larger than the sum of its proper divisors (12181529).

66553711 is a wasteful number, since it uses less digits than its factorization.

66553711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23094 (or 23087 counting only the distinct ones).

The product of its digits is 18900, while the sum is 34.

The square root of 66553711 is about 8158.0457831517. The cubic root of 66553711 is about 405.2509971848.

The spelling of 66553711 in words is "sixty-six million, five hundred fifty-three thousand, seven hundred eleven".