66527081 has 4 divisors (see below), whose sum is σ = 66671232. Its totient is φ = 66382932.

The previous prime is 66527053. The next prime is 66527099. The reversal of 66527081 is 18072566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66527081 - 2¹⁸ = 66264937 is a prime.

It is a super-2 number, since 2×66527081² = 8851705012761122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66529081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71381 + ... + 72306.

It is an arithmetic number, because the mean of its divisors is an integer number (16667808).

Almost surely, 2^66527081 is an apocalyptic number.

It is an amenable number.

66527081 is a deficient number, since it is larger than the sum of its proper divisors (144151).

66527081 is a wasteful number, since it uses less digits than its factorization.

66527081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144150.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 66527081 is about 8156.4134887829. The cubic root of 66527081 is about 405.1969392237.

The spelling of 66527081 in words is "sixty-six million, five hundred twenty-seven thousand, eighty-one".