61571162666 has 16 divisors (see below), whose sum is σ = 105311763144. Its totient is φ = 26745844224.

The previous prime is 61571162663. The next prime is 61571162677. The reversal of 61571162666 is 66626117516.

It can be written as a sum of positive squares in 4 ways, for example, as 56841712225 + 4729450441 = 238415^2 + 68771^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61571162666.

It is not an unprimeable number, because it can be changed into a prime (61571162663) 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 7 ways as a sum of consecutive naturals, for example, 69650195 + ... + 69651078.

Almost surely, 2^61571162666 is an apocalyptic number.

61571162666 is a deficient number, since it is larger than the sum of its proper divisors (43740600478).

61571162666 is a wasteful number, since it uses less digits than its factorization.

61571162666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139301305.

The product of its digits is 544320, while the sum is 47.

The spelling of 61571162666 in words is "sixty-one billion, five hundred seventy-one million, one hundred sixty-two thousand, six hundred sixty-six".