66640035 has 32 divisors (see below), whose sum is σ = 132936192. Its totient is φ = 27694080.

The previous prime is 66640019. The next prime is 66640043. The reversal of 66640035 is 53004666.

It is not a de Polignac number, because 66640035 - 2⁴ = 66640019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66639984 and 66640011.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27694 + ... + 30003.

It is an arithmetic number, because the mean of its divisors is an integer number (4154256).

Almost surely, 2^66640035 is an apocalyptic number.

66640035 is a deficient number, since it is larger than the sum of its proper divisors (66296157).

66640035 is a wasteful number, since it uses less digits than its factorization.

66640035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57723.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66640035 is about 8163.3347965155. The cubic root of 66640035 is about 405.4261327883.

It can be divided in two parts, 666400 and 35, that added together give a triangular number (666435 = T₁₁₅₄).

The spelling of 66640035 in words is "sixty-six million, six hundred forty thousand, thirty-five".