54556615561 has 8 divisors (see below), whose sum is σ = 65632018880. Its totient is φ = 44301612528.

The previous prime is 54556615499. The next prime is 54556615573. The reversal of 54556615561 is 16551665545.

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 54556615561 - 2¹¹ = 54556613513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54556615591) 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, 205099926 + ... + 205100191.

It is an arithmetic number, because the mean of its divisors is an integer number (8204002360).

Almost surely, 2^54556615561 is an apocalyptic number.

It is an amenable number.

54556615561 is a deficient number, since it is larger than the sum of its proper divisors (11075403319).

54556615561 is a wasteful number, since it uses less digits than its factorization.

54556615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410200143.

The product of its digits is 2700000, while the sum is 49.

The spelling of 54556615561 in words is "fifty-four billion, five hundred fifty-six million, six hundred fifteen thousand, five hundred sixty-one".