66785745 has 32 divisors (see below), whose sum is σ = 116250624. Its totient is φ = 32544000.

The previous prime is 66785743. The next prime is 66785773. The reversal of 66785745 is 54758766.

It is not a de Polignac number, because 66785745 - 2¹ = 66785743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66785694 and 66785703.

It is not an unprimeable number, because it can be changed into a prime (66785743) 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, 18000 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (3632832).

Almost surely, 2^66785745 is an apocalyptic number.

66785745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66785745 is a deficient number, since it is larger than the sum of its proper divisors (49464879).

66785745 is a wasteful number, since it uses less digits than its factorization.

66785745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513.

The product of its digits is 1411200, while the sum is 48.

The square root of 66785745 is about 8172.2545848744. The cubic root of 66785745 is about 405.7214089337.

The spelling of 66785745 in words is "sixty-six million, seven hundred eighty-five thousand, seven hundred forty-five".