66603377416 has 8 divisors (see below), whose sum is σ = 124881332670. Its totient is φ = 33301688704.

The previous prime is 66603377413. The next prime is 66603377497. The reversal of 66603377416 is 61477330666.

66603377416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 65918508516 + 684868900 = 256746^2 + 26170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66603377416.

It is not an unprimeable number, because it can be changed into a prime (66603377411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4162711081 + ... + 4162711096.

Almost surely, 2^66603377416 is an apocalyptic number.

It is an amenable number.

66603377416 is a deficient number, since it is larger than the sum of its proper divisors (58277955254).

66603377416 is a wasteful number, since it uses less digits than its factorization.

66603377416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325422183 (or 8325422179 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 49.

The spelling of 66603377416 in words is "sixty-six billion, six hundred three million, three hundred seventy-seven thousand, four hundred sixteen".