53805388721 has 36 divisors (see below), whose sum is σ = 65167051968. Its totient is φ = 43435656000.

The previous prime is 53805388691. The next prime is 53805388723. The reversal of 53805388721 is 12788350835.

It is not a de Polignac number, because 53805388721 - 2⁶ = 53805388657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53805388721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53805388723) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 297267251 + ... + 297267431.

It is an arithmetic number, because the mean of its divisors is an integer number (1810195888).

Almost surely, 2^53805388721 is an apocalyptic number.

It is an amenable number.

53805388721 is a deficient number, since it is larger than the sum of its proper divisors (11361663247).

53805388721 is an equidigital number, since it uses as much as digits as its factorization.

53805388721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 53805388721 in words is "fifty-three billion, eight hundred five million, three hundred eighty-eight thousand, seven hundred twenty-one".