8555008772381 has 16 divisors (see below), whose sum is σ = 9398111116800. Its totient is φ = 7751288186928.

The previous prime is 8555008772377. The next prime is 8555008772423. The reversal of 8555008772381 is 1832778005558.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8555008772381 - 2² = 8555008772377 is a prime.

It is a super-2 number, since 2×8555008772381² (a number of 27 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 8555008772381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8555008772881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1798790 + ... + 4510616.

It is an arithmetic number, because the mean of its divisors is an integer number (587381944800).

Almost surely, 2^{8555008772381} is an apocalyptic number.

It is an amenable number.

8555008772381 is a deficient number, since it is larger than the sum of its proper divisors (843102344419).

8555008772381 is a wasteful number, since it uses less digits than its factorization.

8555008772381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719088.

The product of its (nonzero) digits is 18816000, while the sum is 59.

The spelling of 8555008772381 in words is "eight trillion, five hundred fifty-five billion, eight million, seven hundred seventy-two thousand, three hundred eighty-one".