66742705 has 8 divisors (see below), whose sum is σ = 80248104. Its totient is φ = 53289600.

The previous prime is 66742703. The next prime is 66742727. The reversal of 66742705 is 50724766.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 66650896 = 303^2 + 8164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66742705 - 2¹ = 66742703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66742703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10206 + ... + 15415.

It is an arithmetic number, because the mean of its divisors is an integer number (10031013).

Almost surely, 2^66742705 is an apocalyptic number.

It is an amenable number.

66742705 is a deficient number, since it is larger than the sum of its proper divisors (13505399).

66742705 is a wasteful number, since it uses less digits than its factorization.

66742705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26147.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 66742705 is about 8169.6208602358. The cubic root of 66742705 is about 405.6342346325.

The spelling of 66742705 in words is "sixty-six million, seven hundred forty-two thousand, seven hundred five".