54640215561 has 16 divisors (see below), whose sum is σ = 76713143040. Its totient is φ = 34498305360.

The previous prime is 54640215547. The next prime is 54640215563. The reversal of 54640215561 is 16551204645.

It is not a de Polignac number, because 54640215561 - 2¹⁰ = 54640214537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54640215563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20266 + ... + 331196.

It is an arithmetic number, because the mean of its divisors is an integer number (4794571440).

Almost surely, 2^54640215561 is an apocalyptic number.

It is an amenable number.

54640215561 is a deficient number, since it is larger than the sum of its proper divisors (22072927479).

54640215561 is a wasteful number, since it uses less digits than its factorization.

54640215561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314036.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 54640215561 in words is "fifty-four billion, six hundred forty million, two hundred fifteen thousand, five hundred sixty-one".