53544511621 has 4 divisors (see below), whose sum is σ = 54298659744. Its totient is φ = 52790363500.

The previous prime is 53544511609. The next prime is 53544511627. The reversal of 53544511621 is 12611544535.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53544511621 - 2⁹ = 53544511109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53544511627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377073955 + ... + 377074096.

It is an arithmetic number, because the mean of its divisors is an integer number (13574664936).

Almost surely, 2^53544511621 is an apocalyptic number.

It is an amenable number.

53544511621 is a deficient number, since it is larger than the sum of its proper divisors (754148123).

53544511621 is an equidigital number, since it uses as much as digits as its factorization.

53544511621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754148122.

The product of its digits is 72000, while the sum is 37.

The spelling of 53544511621 in words is "fifty-three billion, five hundred forty-four million, five hundred eleven thousand, six hundred twenty-one".