53668611821 has 4 divisors (see below), whose sum is σ = 58547576544. Its totient is φ = 48789647100.

The previous prime is 53668611803. The next prime is 53668611863. The reversal of 53668611821 is 12811686635.

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 53668611821 - 2²² = 53664417517 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 (53968611821) 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, 2439482345 + ... + 2439482366.

It is an arithmetic number, because the mean of its divisors is an integer number (14636894136).

Almost surely, 2^53668611821 is an apocalyptic number.

It is an amenable number.

53668611821 is a deficient number, since it is larger than the sum of its proper divisors (4878964723).

53668611821 is a wasteful number, since it uses less digits than its factorization.

53668611821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878964722.

The product of its digits is 414720, while the sum is 47.

The spelling of 53668611821 in words is "fifty-three billion, six hundred sixty-eight million, six hundred eleven thousand, eight hundred twenty-one".