66655874 has 16 divisors (see below), whose sum is σ = 102176640. Its totient is φ = 32600880.

The previous prime is 66655871. The next prime is 66655877. The reversal of 66655874 is 47855666.

66655874 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66655871) and next prime (66655877).

It is not an unprimeable number, because it can be changed into a prime (66655871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44957 + ... + 46415.

It is an arithmetic number, because the mean of its divisors is an integer number (6386040).

Almost surely, 2^66655874 is an apocalyptic number.

66655874 is a deficient number, since it is larger than the sum of its proper divisors (35520766).

66655874 is a wasteful number, since it uses less digits than its factorization.

66655874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945.

The product of its digits is 1209600, while the sum is 47.

The square root of 66655874 is about 8164.3048693689. The cubic root of 66655874 is about 405.4582507978.

The spelling of 66655874 in words is "sixty-six million, six hundred fifty-five thousand, eight hundred seventy-four".