53361555721 has 4 divisors (see below), whose sum is σ = 53471128192. Its totient is φ = 53251983252.

The previous prime is 53361555691. The next prime is 53361555739. The reversal of 53361555721 is 12755516335.

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 53361555721 - 2⁹ = 53361555209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53361555781) 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, 54785505 + ... + 54786478.

It is an arithmetic number, because the mean of its divisors is an integer number (13367782048).

Almost surely, 2^53361555721 is an apocalyptic number.

It is an amenable number.

53361555721 is a deficient number, since it is larger than the sum of its proper divisors (109572471).

53361555721 is a wasteful number, since it uses less digits than its factorization.

53361555721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109572470.

The product of its digits is 472500, while the sum is 43.

The spelling of 53361555721 in words is "fifty-three billion, three hundred sixty-one million, five hundred fifty-five thousand, seven hundred twenty-one".