66711456 has 72 divisors (see below), whose sum is σ = 216818784. Its totient is φ = 19059840.

The previous prime is 66711439. The next prime is 66711457. The reversal of 66711456 is 65411766.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66711456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66711457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14530 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (3011372).

Almost surely, 2^66711456 is an apocalyptic number.

It is an amenable number.

66711456 is an abundant number, since it is smaller than the sum of its proper divisors (150107328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66711456 is a wasteful number, since it uses less digits than its factorization.

66711456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33114 (or 33103 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 66711456 is about 8167.7081240701. The cubic root of 66711456 is about 405.5709186343.

The spelling of 66711456 in words is "sixty-six million, seven hundred eleven thousand, four hundred fifty-six".