6551121355535 has 8 divisors (see below), whose sum is σ = 7918727712336. Its totient is φ = 5202642360640.

The previous prime is 6551121355481. The next prime is 6551121355543. The reversal of 6551121355535 is 5355531211556.

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

It is not a de Polignac number, because 6551121355535 - 2²² = 6551117161231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6551121355535.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4781839721 + ... + 4781841090.

It is an arithmetic number, because the mean of its divisors is an integer number (989840964042).

Almost surely, 2^{6551121355535} is an apocalyptic number.

6551121355535 is a deficient number, since it is larger than the sum of its proper divisors (1367606356801).

6551121355535 is a wasteful number, since it uses less digits than its factorization.

6551121355535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9563680953.

The product of its digits is 1687500, while the sum is 47.

The spelling of 6551121355535 in words is "six trillion, five hundred fifty-one billion, one hundred twenty-one million, three hundred fifty-five thousand, five hundred thirty-five".