55121360601661 has 8 divisors (see below), whose sum is σ = 55667591739864. Its totient is φ = 54575138779200.

The previous prime is 55121360601641. The next prime is 55121360601701. The reversal of 55121360601661 is 16610606312155.

It can be written as a sum of positive squares in 4 ways, for example, as 6983435179161 + 48137925422500 = 2642619^2 + 6938150^2 .

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 55121360601661 - 2⁹ = 55121360601149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121360601631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9879231 + ... + 14416723.

It is an arithmetic number, because the mean of its divisors is an integer number (6958448967483).

Almost surely, 2^{55121360601661} is an apocalyptic number.

It is an amenable number.

55121360601661 is a deficient number, since it is larger than the sum of its proper divisors (546231138203).

55121360601661 is a wasteful number, since it uses less digits than its factorization.

55121360601661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4657871.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 55121360601661 in words is "fifty-five trillion, one hundred twenty-one billion, three hundred sixty million, six hundred one thousand, six hundred sixty-one".