54666440136521 has 16 divisors (see below), whose sum is σ = 57588531506688. Its totient is φ = 51825489724800.

The previous prime is 54666440136493. The next prime is 54666440136527. The reversal of 54666440136521 is 12563104466645.

It is a cyclic number.

It is not a de Polignac number, because 54666440136521 - 2¹⁸ = 54666439874377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54666440136527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72330980 + ... + 73082853.

It is an arithmetic number, because the mean of its divisors is an integer number (3599283219168).

Almost surely, 2^{54666440136521} is an apocalyptic number.

It is an amenable number.

54666440136521 is a deficient number, since it is larger than the sum of its proper divisors (2922091370167).

54666440136521 is a wasteful number, since it uses less digits than its factorization.

54666440136521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145414112.

The product of its (nonzero) digits is 12441600, while the sum is 53.

The spelling of 54666440136521 in words is "fifty-four trillion, six hundred sixty-six billion, four hundred forty million, one hundred thirty-six thousand, five hundred twenty-one".