66634402 has 16 divisors (see below), whose sum is σ = 103611960. Its totient is φ = 32101888.

The previous prime is 66634397. The next prime is 66634417. The reversal of 66634402 is 20443666.

66634402 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 4 ways, for example, as 61921161 + 4713241 = 7869^2 + 2171^2 .

It is an unprimeable number.

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, 38418 + ... + 40114.

Almost surely, 2^66634402 is an apocalyptic number.

66634402 is a deficient number, since it is larger than the sum of its proper divisors (36977558).

66634402 is a wasteful number, since it uses less digits than its factorization.

66634402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 66634402 is about 8162.9897709111. The cubic root of 66634402 is about 405.4147090760.

The spelling of 66634402 in words is "sixty-six million, six hundred thirty-four thousand, four hundred two".