66629770 has 24 divisors (see below), whose sum is σ = 126584964. Its totient is φ = 25247808.

The previous prime is 66629767. The next prime is 66629831. The reversal of 66629770 is 7792666.

It is a happy number.

66629770 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 2 ways, for example, as 66438801 + 190969 = 8151^2 + 437^2 .

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 11 ways as a sum of consecutive naturals, for example, 5619 + ... + 12838.

Almost surely, 2^66629770 is an apocalyptic number.

66629770 is a deficient number, since it is larger than the sum of its proper divisors (59955194).

66629770 is a wasteful number, since it uses less digits than its factorization.

66629770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18502 (or 18483 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 66629770 is about 8162.7060464040. The cubic root of 66629770 is about 405.4053149073.

The spelling of 66629770 in words is "sixty-six million, six hundred twenty-nine thousand, seven hundred seventy".