61163917666 has 4 divisors (see below), whose sum is σ = 91745876502. Its totient is φ = 30581958832.

The previous prime is 61163917597. The next prime is 61163917667. The reversal of 61163917666 is 66671936116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 50424948025 + 10738969641 = 224555^2 + 103629^2 .

It is not an unprimeable number, because it can be changed into a prime (61163917667) 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 as a sum of consecutive naturals, namely, 15290979415 + ... + 15290979418.

Almost surely, 2^61163917666 is an apocalyptic number.

61163917666 is a deficient number, since it is larger than the sum of its proper divisors (30581958836).

61163917666 is a wasteful number, since it uses less digits than its factorization.

61163917666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30581958835.

The product of its digits is 1469664, while the sum is 52.

The spelling of 61163917666 in words is "sixty-one billion, one hundred sixty-three million, nine hundred seventeen thousand, six hundred sixty-six".