8555561381 has 8 divisors (see below), whose sum is σ = 8832691200. Its totient is φ = 8278503120.

The previous prime is 8555561369. The next prime is 8555561407. The reversal of 8555561381 is 1831655558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8555561381 is a prime.

It is a super-2 number, since 2×8555561381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8555561081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337415 + ... + 361883.

It is an arithmetic number, because the mean of its divisors is an integer number (1104086400).

Almost surely, 2^8555561381 is an apocalyptic number.

It is an amenable number.

8555561381 is a deficient number, since it is larger than the sum of its proper divisors (277129819).

8555561381 is a wasteful number, since it uses less digits than its factorization.

8555561381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35779.

The product of its digits is 720000, while the sum is 47.

The square root of 8555561381 is about 92496.2776602388. The cubic root of 8555561381 is about 2045.2646107580.

The spelling of 8555561381 in words is "eight billion, five hundred fifty-five million, five hundred sixty-one thousand, three hundred eighty-one".