51196330621 has 2 divisors, whose sum is σ = 51196330622. Its totient is φ = 51196330620.

The previous prime is 51196330589. The next prime is 51196330667. The reversal of 51196330621 is 12603369115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38001213721 + 13195116900 = 194939^2 + 114870^2 .

It is a cyclic number.

It is not a de Polignac number, because 51196330621 - 2⁵ = 51196330589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51196331621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25598165310 + 25598165311.

It is an arithmetic number, because the mean of its divisors is an integer number (25598165311).

Almost surely, 2^51196330621 is an apocalyptic number.

It is an amenable number.

51196330621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51196330621 is an equidigital number, since it uses as much as digits as its factorization.

51196330621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

Adding to 51196330621 its reverse (12603369115), we get a palindrome (63799699736).

The spelling of 51196330621 in words is "fifty-one billion, one hundred ninety-six million, three hundred thirty thousand, six hundred twenty-one".