66205071 has 6 divisors (see below), whose sum is σ = 95629560. Its totient is φ = 44136708.

The previous prime is 66205049. The next prime is 66205091. The reversal of 66205071 is 17050266.

It is not a de Polignac number, because 66205071 - 2¹⁷ = 66073999 is a prime.

It is a super-2 number, since 2×66205071² = 8766222852230082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66205031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3678051 + ... + 3678068.

It is an arithmetic number, because the mean of its divisors is an integer number (15938260).

Almost surely, 2^66205071 is an apocalyptic number.

66205071 is a deficient number, since it is larger than the sum of its proper divisors (29424489).

66205071 is a wasteful number, since it uses less digits than its factorization.

66205071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7356125 (or 7356122 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66205071 is about 8136.6498634266. The cubic root of 66205071 is about 404.5421254327.

The spelling of 66205071 in words is "sixty-six million, two hundred five thousand, seventy-one".