66061897 has 4 divisors (see below), whose sum is σ = 72067536. Its totient is φ = 60056260.

The previous prime is 66061883. The next prime is 66061901. The reversal of 66061897 is 79816066.

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 not a de Polignac number, because 66061897 - 2¹¹ = 66059849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66061817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3002803 + ... + 3002824.

It is an arithmetic number, because the mean of its divisors is an integer number (18016884).

Almost surely, 2^66061897 is an apocalyptic number.

It is an amenable number.

66061897 is a deficient number, since it is larger than the sum of its proper divisors (6005639).

66061897 is a wasteful number, since it uses less digits than its factorization.

66061897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005638.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 66061897 is about 8127.8470088948. The cubic root of 66061897 is about 404.2502962428.

The spelling of 66061897 in words is "sixty-six million, sixty-one thousand, eight hundred ninety-seven".