66521095 has 16 divisors (see below), whose sum is σ = 81857952. Its totient is φ = 51875200.

The previous prime is 66521093. The next prime is 66521101. The reversal of 66521095 is 59012566.

It is a happy number.

66521095 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66521095 - 2¹ = 66521093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66521095.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45120 + ... + 46570.

It is an arithmetic number, because the mean of its divisors is an integer number (5116122).

Almost surely, 2^66521095 is an apocalyptic number.

66521095 is a deficient number, since it is larger than the sum of its proper divisors (15336857).

66521095 is a wasteful number, since it uses less digits than its factorization.

66521095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 66521095 is about 8156.0465300291. The cubic root of 66521095 is about 405.1847858691.

The spelling of 66521095 in words is "sixty-six million, five hundred twenty-one thousand, ninety-five".