55606667217161 has 4 divisors (see below), whose sum is σ = 55608175967892. Its totient is φ = 55605158466432.

The previous prime is 55606667217139. The next prime is 55606667217169. The reversal of 55606667217161 is 16171276660655.

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 24543255433225 + 31063411783936 = 4954115^2 + 5573456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55606667217161 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 55606667217161.

It is not an unprimeable number, because it can be changed into a prime (55606667217169) 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, 754320080 + ... + 754393793.

It is an arithmetic number, because the mean of its divisors is an integer number (13902043991973).

Almost surely, 2^{55606667217161} is an apocalyptic number.

It is an amenable number.

55606667217161 is a deficient number, since it is larger than the sum of its proper divisors (1508750731).

55606667217161 is a wasteful number, since it uses less digits than its factorization.

55606667217161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508750730.

The product of its (nonzero) digits is 19051200, while the sum is 59.

The spelling of 55606667217161 in words is "fifty-five trillion, six hundred six billion, six hundred sixty-seven million, two hundred seventeen thousand, one hundred sixty-one".