55921775785129 has 8 divisors (see below), whose sum is σ = 56334465933768. Its totient is φ = 55509150883200.

The previous prime is 55921775785111. The next prime is 55921775785177. The reversal of 55921775785129 is 92158757712955.

55921775785129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 36132445594729 + 19789330190400 = 6011027^2 + 4448520^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55921775785129 - 2²¹ = 55921773687977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55921775725129) 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 7 ways as a sum of consecutive naturals, for example, 14590522 + ... + 18020179.

It is an arithmetic number, because the mean of its divisors is an integer number (7041808241721).

Almost surely, 2^{55921775785129} is an apocalyptic number.

It is an amenable number.

55921775785129 is a deficient number, since it is larger than the sum of its proper divisors (412690148639).

55921775785129 is a wasteful number, since it uses less digits than its factorization.

55921775785129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32623355.

The product of its digits is 555660000, while the sum is 73.

The spelling of 55921775785129 in words is "fifty-five trillion, nine hundred twenty-one billion, seven hundred seventy-five million, seven hundred eighty-five thousand, one hundred twenty-nine".