6555433121391 has 256 divisors, whose sum is σ = 12419145400320. Its totient is φ = 2970971136000.

The previous prime is 6555433121353. The next prime is 6555433121423. The reversal of 6555433121391 is 1931213345556.

It is not a de Polignac number, because 6555433121391 - 2⁹ = 6555433120879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6555433121391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555433121311) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 448350061 + ... + 448364681.

It is an arithmetic number, because the mean of its divisors is an integer number (48512286720).

Almost surely, 2^{6555433121391} is an apocalyptic number.

6555433121391 is a deficient number, since it is larger than the sum of its proper divisors (5863712278929).

6555433121391 is a wasteful number, since it uses less digits than its factorization.

6555433121391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14846.

The product of its digits is 1458000, while the sum is 48.

The spelling of 6555433121391 in words is "six trillion, five hundred fifty-five billion, four hundred thirty-three million, one hundred twenty-one thousand, three hundred ninety-one".