54018591561 has 27 divisors (see below), whose sum is σ = 85777233997. Its totient is φ = 32733891960.

The previous prime is 54018591559. The next prime is 54018591623. The reversal of 54018591561 is 16519581045.

The square root of 54018591561 is 232419.

It is a perfect power (a square), and thus also a powerful number.

54018591561 is a `hidden beast` number, since 5 + 4 + 0 + 1 + 8 + 591 + 56 + 1 = 666.

It is not a de Polignac number, because 54018591561 - 2¹ = 54018591559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54018599561) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7666306 + ... + 7673348.

Almost surely, 2^54018591561 is an apocalyptic number.

54018591561 is the 232419-th square number.

54018591561 is the 116210-th centered octagonal number.

It is an amenable number.

54018591561 is a deficient number, since it is larger than the sum of its proper divisors (31758642436).

54018591561 is an frugal number, since it uses more digits than its factorization.

54018591561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14114 (or 7057 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 45.

The spelling of 54018591561 in words is "fifty-four billion, eighteen million, five hundred ninety-one thousand, five hundred sixty-one".