50866821653 has 4 divisors (see below), whose sum is σ = 51238112460. Its totient is φ = 50495530848.

The previous prime is 50866821619. The next prime is 50866821713. The reversal of 50866821653 is 35612866805.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9715453489 + 41151368164 = 98567^2 + 202858^2 .

It is a cyclic number.

It is not a de Polignac number, because 50866821653 - 2³⁰ = 49793079829 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 (50866821053) 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, 185645198 + ... + 185645471.

It is an arithmetic number, because the mean of its divisors is an integer number (12809528115).

Almost surely, 2^50866821653 is an apocalyptic number.

It is an amenable number.

50866821653 is a deficient number, since it is larger than the sum of its proper divisors (371290807).

50866821653 is a wasteful number, since it uses less digits than its factorization.

50866821653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371290806.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 50866821653 in words is "fifty billion, eight hundred sixty-six million, eight hundred twenty-one thousand, six hundred fifty-three".