66767745 has 32 divisors (see below), whose sum is σ = 117604224. Its totient is φ = 32076800.

The previous prime is 66767741. The next prime is 66767747. The reversal of 66767745 is 54776766.

It is not a de Polignac number, because 66767745 - 2² = 66767741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66767694 and 66767703.

It is not an unprimeable number, because it can be changed into a prime (66767741) 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, 16855 + ... + 20435.

It is an arithmetic number, because the mean of its divisors is an integer number (3675132).

Almost surely, 2^66767745 is an apocalyptic number.

It is an amenable number.

66767745 is a deficient number, since it is larger than the sum of its proper divisors (50836479).

66767745 is a wasteful number, since it uses less digits than its factorization.

66767745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3713.

The product of its digits is 1481760, while the sum is 48.

The square root of 66767745 is about 8171.1532233829. The cubic root of 66767745 is about 405.6849558376.

The spelling of 66767745 in words is "sixty-six million, seven hundred sixty-seven thousand, seven hundred forty-five".