51061167221 has 2 divisors, whose sum is σ = 51061167222. Its totient is φ = 51061167220.

The previous prime is 51061167217. The next prime is 51061167229. The reversal of 51061167221 is 12276116015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27452844721 + 23608322500 = 165689^2 + 153650^2 .

It is a cyclic number.

It is not a de Polignac number, because 51061167221 - 2² = 51061167217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51061167229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25530583610 + 25530583611.

It is an arithmetic number, because the mean of its divisors is an integer number (25530583611).

Almost surely, 2^51061167221 is an apocalyptic number.

It is an amenable number.

51061167221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51061167221 is an equidigital number, since it uses as much as digits as its factorization.

51061167221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 51061167221 in words is "fifty-one billion, sixty-one million, one hundred sixty-seven thousand, two hundred twenty-one".