66137705 has 8 divisors (see below), whose sum is σ = 79417032. Its totient is φ = 52875648.

The previous prime is 66137681. The next prime is 66137711. The reversal of 66137705 is 50773166.

It can be written as a sum of positive squares in 4 ways, for example, as 802816 + 65334889 = 896^2 + 8083^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66137705 - 2⁶ = 66137641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6647 + ... + 13283.

It is an arithmetic number, because the mean of its divisors is an integer number (9927129).

Almost surely, 2^66137705 is an apocalyptic number.

It is an amenable number.

66137705 is a deficient number, since it is larger than the sum of its proper divisors (13279327).

66137705 is a wasteful number, since it uses less digits than its factorization.

66137705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8635.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 66137705 is about 8132.5091453991. The cubic root of 66137705 is about 404.4048668962.

The spelling of 66137705 in words is "sixty-six million, one hundred thirty-seven thousand, seven hundred five".