55661220177037 has 4 divisors (see below), whose sum is σ = 55661245667260. Its totient is φ = 55661194686816.

The previous prime is 55661220177019. The next prime is 55661220177127. The reversal of 55661220177037 is 73077102216655.

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 2672633162761 + 52988587014276 = 1634819^2 + 7279326^2 .

It is a cyclic number.

It is not a de Polignac number, because 55661220177037 - 2⁷ = 55661220176909 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 (55661220117037) 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, 9127362 + ... + 13951027.

It is an arithmetic number, because the mean of its divisors is an integer number (13915311416815).

Almost surely, 2^{55661220177037} is an apocalyptic number.

It is an amenable number.

55661220177037 is a deficient number, since it is larger than the sum of its proper divisors (25490223).

55661220177037 is a wasteful number, since it uses less digits than its factorization.

55661220177037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25490222.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 55661220177037 in words is "fifty-five trillion, six hundred sixty-one billion, two hundred twenty million, one hundred seventy-seven thousand, thirty-seven".