51550666621 has 8 divisors (see below), whose sum is σ = 51776314304. Its totient is φ = 51325116480.

The previous prime is 51550666619. The next prime is 51550666631. The reversal of 51550666621 is 12666605515.

51550666621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51550666621 - 2¹ = 51550666619 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 (51550666631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1159810 + ... + 1203436.

It is an arithmetic number, because the mean of its divisors is an integer number (6472039288).

Almost surely, 2^51550666621 is an apocalyptic number.

It is an amenable number.

51550666621 is a deficient number, since it is larger than the sum of its proper divisors (225647683).

51550666621 is a wasteful number, since it uses less digits than its factorization.

51550666621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48771.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 51550666621 in words is "fifty-one billion, five hundred fifty million, six hundred sixty-six thousand, six hundred twenty-one".