3551217255081 has 16 divisors (see below), whose sum is σ = 5261093219520. Its totient is φ = 2367464391360.

The previous prime is 3551217255059. The next prime is 3551217255107. The reversal of 3551217255081 is 1805527121553.

3551217255081 is a `hidden beast` number, since 3 + 5 + 5 + 1 + 2 + 17 + 2 + 550 + 81 = 666.

It is not a de Polignac number, because 3551217255081 - 2⁷ = 3551217254953 is a prime.

It is a super-2 number, since 2×3551217255081² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3551217255011) 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 in 15 ways as a sum of consecutive naturals, for example, 6778561 + ... + 7283633.

It is an arithmetic number, because the mean of its divisors is an integer number (328818326220).

Almost surely, 2^{3551217255081} is an apocalyptic number.

It is an amenable number.

3551217255081 is a deficient number, since it is larger than the sum of its proper divisors (1709875964439).

3551217255081 is a wasteful number, since it uses less digits than its factorization.

3551217255081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765493 (or 765487 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 45.

The spelling of 3551217255081 in words is "three trillion, five hundred fifty-one billion, two hundred seventeen million, two hundred fifty-five thousand, eighty-one".