54021565320517 has 8 divisors (see below), whose sum is σ = 57301996216536. Its totient is φ = 50752544620032.

The previous prime is 54021565320431. The next prime is 54021565320529. The reversal of 54021565320517 is 71502356512045.

It can be written as a sum of positive squares in 4 ways, for example, as 15247705138561 + 38773860181956 = 3904831^2 + 6226866^2 .

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 54021565320517 - 2²⁷ = 54021431102789 is a prime.

It is a super-2 number, since 2×54021565320517² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54021565327517) 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, 2852539128 + ... + 2852558065.

It is an arithmetic number, because the mean of its divisors is an integer number (7162749527067).

Almost surely, 2^{54021565320517} is an apocalyptic number.

It is an amenable number.

54021565320517 is a deficient number, since it is larger than the sum of its proper divisors (3280430896019).

54021565320517 is a wasteful number, since it uses less digits than its factorization.

54021565320517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705097767.

The product of its (nonzero) digits is 1260000, while the sum is 46.

The spelling of 54021565320517 in words is "fifty-four trillion, twenty-one billion, five hundred sixty-five million, three hundred twenty thousand, five hundred seventeen".