8551966642 has 4 divisors (see below), whose sum is σ = 12827949966. Its totient is φ = 4275983320.

The previous prime is 8551966607. The next prime is 8551966649. The reversal of 8551966642 is 2466691558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2466691558 = 2 ⋅1233345779.

It can be written as a sum of positive squares in only one way, i.e., 7409594241 + 1142372401 = 86079^2 + 33799^2 .

It is a super-2 number, since 2×8551966642² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8551966642.

It is not an unprimeable number, because it can be changed into a prime (8551966649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2137991659 + ... + 2137991662.

Almost surely, 2^8551966642 is an apocalyptic number.

8551966642 is a deficient number, since it is larger than the sum of its proper divisors (4275983324).

8551966642 is a wasteful number, since it uses less digits than its factorization.

8551966642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4275983323.

The product of its digits is 3110400, while the sum is 52.

The square root of 8551966642 is about 92476.8438150870. The cubic root of 8551966642 is about 2044.9781217682.

The spelling of 8551966642 in words is "eight billion, five hundred fifty-one million, nine hundred sixty-six thousand, six hundred forty-two".