51168227621 has 8 divisors (see below), whose sum is σ = 59581332864. Its totient is φ = 43030962000.

The previous prime is 51168227603. The next prime is 51168227623. The reversal of 51168227621 is 12672286115.

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 51168227621 - 2¹⁸ = 51167965477 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 (51168227623) 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, 68959505 + ... + 68960246.

It is an arithmetic number, because the mean of its divisors is an integer number (7447666608).

Almost surely, 2^51168227621 is an apocalyptic number.

It is an amenable number.

51168227621 is a deficient number, since it is larger than the sum of its proper divisors (8413105243).

51168227621 is a wasteful number, since it uses less digits than its factorization.

51168227621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137919811.

The product of its digits is 80640, while the sum is 41.

The spelling of 51168227621 in words is "fifty-one billion, one hundred sixty-eight million, two hundred twenty-seven thousand, six hundred twenty-one".