55401216061 has 4 divisors (see below), whose sum is σ = 55402738300. Its totient is φ = 55399693824.

The previous prime is 55401215977. The next prime is 55401216067. The reversal of 55401216061 is 16061210455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19917959161 + 35483256900 = 141131^2 + 188370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55401216061 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 (55401216067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705156 + ... + 779773.

It is an arithmetic number, because the mean of its divisors is an integer number (13850684575).

Almost surely, 2^55401216061 is an apocalyptic number.

It is an amenable number.

55401216061 is a deficient number, since it is larger than the sum of its proper divisors (1522239).

55401216061 is a wasteful number, since it uses less digits than its factorization.

55401216061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522238.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 55401216061 in words is "fifty-five billion, four hundred one million, two hundred sixteen thousand, sixty-one".