51651397673 has 2 divisors, whose sum is σ = 51651397674. Its totient is φ = 51651397672.

The previous prime is 51651397579. The next prime is 51651397709. The reversal of 51651397673 is 37679315615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35454253849 + 16197143824 = 188293^2 + 127268^2 .

It is a cyclic number.

It is not a de Polignac number, because 51651397673 - 2¹⁰ = 51651396649 is a prime.

It is not a weakly prime, because it can be changed into another prime (51651397073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25825698836 + 25825698837.

It is an arithmetic number, because the mean of its divisors is an integer number (25825698837).

Almost surely, 2^51651397673 is an apocalyptic number.

It is an amenable number.

51651397673 is a deficient number, since it is larger than the sum of its proper divisors (1).

51651397673 is an equidigital number, since it uses as much as digits as its factorization.

51651397673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3572100, while the sum is 53.

The spelling of 51651397673 in words is "fifty-one billion, six hundred fifty-one million, three hundred ninety-seven thousand, six hundred seventy-three".