66676905 has 32 divisors (see below), whose sum is σ = 119500800. Its totient is φ = 35271936.

The previous prime is 66676901. The next prime is 66676913. The reversal of 66676905 is 50967666.

It is not a de Polignac number, because 66676905 - 2² = 66676901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66676901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15201 + ... + 19089.

It is an arithmetic number, because the mean of its divisors is an integer number (3734400).

Almost surely, 2^66676905 is an apocalyptic number.

It is an amenable number.

66676905 is a deficient number, since it is larger than the sum of its proper divisors (52823895).

66676905 is a wasteful number, since it uses less digits than its factorization.

66676905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030 (or 4024 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 66676905 is about 8165.5927525196. The cubic root of 66676905 is about 405.5008891795.

The spelling of 66676905 in words is "sixty-six million, six hundred seventy-six thousand, nine hundred five".