66576261 has 4 divisors (see below), whose sum is σ = 88768352. Its totient is φ = 44384172.

The previous prime is 66576259. The next prime is 66576269. The reversal of 66576261 is 16267566.

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 66576261 - 2¹ = 66576259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66576269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11096041 + ... + 11096046.

It is an arithmetic number, because the mean of its divisors is an integer number (22192088).

Almost surely, 2^66576261 is an apocalyptic number.

It is an amenable number.

66576261 is a deficient number, since it is larger than the sum of its proper divisors (22192091).

66576261 is a wasteful number, since it uses less digits than its factorization.

66576261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22192090.

The product of its digits is 90720, while the sum is 39.

The square root of 66576261 is about 8159.4277372865. The cubic root of 66576261 is about 405.2967616154.

The spelling of 66576261 in words is "sixty-six million, five hundred seventy-six thousand, two hundred sixty-one".