53806521765 has 16 divisors (see below), whose sum is σ = 86294935296. Its totient is φ = 28628644800.

The previous prime is 53806521709. The next prime is 53806521779. The reversal of 53806521765 is 56712560835.

It is not a de Polignac number, because 53806521765 - 2¹¹ = 53806519717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4253901 + ... + 4266530.

It is an arithmetic number, because the mean of its divisors is an integer number (5393433456).

Almost surely, 2^53806521765 is an apocalyptic number.

It is an amenable number.

53806521765 is a deficient number, since it is larger than the sum of its proper divisors (32488413531).

53806521765 is a wasteful number, since it uses less digits than its factorization.

53806521765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8520860.

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 53806521765 in words is "fifty-three billion, eight hundred six million, five hundred twenty-one thousand, seven hundred sixty-five".