5555611681 has 4 divisors (see below), whose sum is σ = 5557282864. Its totient is φ = 5553940500.

The previous prime is 5555611673. The next prime is 5555611703. The reversal of 5555611681 is 1861165555.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 5555611681 - 2³ = 5555611673 is a prime.

It is a super-2 number, since 2×5555611681² = 61729642300127291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555611651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830595 + ... + 837256.

It is an arithmetic number, because the mean of its divisors is an integer number (1389320716).

Almost surely, 2^5555611681 is an apocalyptic number.

It is an amenable number.

5555611681 is a deficient number, since it is larger than the sum of its proper divisors (1671183).

5555611681 is a wasteful number, since it uses less digits than its factorization.

5555611681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671182.

The product of its digits is 180000, while the sum is 43.

The square root of 5555611681 is about 74535.9757499692. The cubic root of 5555611681 is about 1771.1035795027.

The spelling of 5555611681 in words is "five billion, five hundred fifty-five million, six hundred eleven thousand, six hundred eighty-one".