66565226661 has 16 divisors (see below), whose sum is σ = 91532795904. Its totient is φ = 43003490544.

The previous prime is 66565226659. The next prime is 66565226713. The reversal of 66565226661 is 16662256566.

It is not a de Polignac number, because 66565226661 - 2¹ = 66565226659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565226461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2015151 + ... + 2047916.

It is an arithmetic number, because the mean of its divisors is an integer number (5720799744).

Almost surely, 2^66565226661 is an apocalyptic number.

It is an amenable number.

66565226661 is a deficient number, since it is larger than the sum of its proper divisors (24967569243).

66565226661 is a wasteful number, since it uses less digits than its factorization.

66565226661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063240.

The product of its digits is 4665600, while the sum is 51.

The spelling of 66565226661 in words is "sixty-six billion, five hundred sixty-five million, two hundred twenty-six thousand, six hundred sixty-one".