66261097 has 4 divisors (see below), whose sum is σ = 75726976. Its totient is φ = 56795220.

The previous prime is 66261089. The next prime is 66261101. The reversal of 66261097 is 79016266.

66261097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66261097 - 2³ = 66261089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66261007) 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 3 ways as a sum of consecutive naturals, for example, 4732929 + ... + 4732942.

It is an arithmetic number, because the mean of its divisors is an integer number (18931744).

Almost surely, 2^66261097 is an apocalyptic number.

It is an amenable number.

66261097 is a deficient number, since it is larger than the sum of its proper divisors (9465879).

66261097 is an equidigital number, since it uses as much as digits as its factorization.

66261097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9465878.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 66261097 is about 8140.0919527976. The cubic root of 66261097 is about 404.6562077651.

The spelling of 66261097 in words is "sixty-six million, two hundred sixty-one thousand, ninety-seven".