54356111516661 has 4 divisors (see below), whose sum is σ = 72474815355552. Its totient is φ = 36237407677772.

The previous prime is 54356111516569. The next prime is 54356111516701. The reversal of 54356111516661 is 16661511165345.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 54356111516661 - 2³⁰ = 54355037774837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54356111516761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9059351919441 + ... + 9059351919446.

It is an arithmetic number, because the mean of its divisors is an integer number (18118703838888).

Almost surely, 2^{54356111516661} is an apocalyptic number.

It is an amenable number.

54356111516661 is a deficient number, since it is larger than the sum of its proper divisors (18118703838891).

54356111516661 is a wasteful number, since it uses less digits than its factorization.

54356111516661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18118703838890.

The product of its digits is 1944000, while the sum is 51.

The spelling of 54356111516661 in words is "fifty-four trillion, three hundred fifty-six billion, one hundred eleven million, five hundred sixteen thousand, six hundred sixty-one".