66534605 has 4 divisors (see below), whose sum is σ = 79841532. Its totient is φ = 53227680.

The previous prime is 66534593. The next prime is 66534647. The reversal of 66534605 is 50643566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43705321 + 22829284 = 6611^2 + 4778^2 .

It is not a de Polignac number, because 66534605 - 2¹⁰ = 66533581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6653456 + ... + 6653465.

It is an arithmetic number, because the mean of its divisors is an integer number (19960383).

Almost surely, 2^66534605 is an apocalyptic number.

It is an amenable number.

66534605 is a deficient number, since it is larger than the sum of its proper divisors (13306927).

66534605 is a wasteful number, since it uses less digits than its factorization.

66534605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13306926.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66534605 is about 8156.8747078768. The cubic root of 66534605 is about 405.2122141403.

The spelling of 66534605 in words is "sixty-six million, five hundred thirty-four thousand, six hundred five".