51863651297 has 2 divisors, whose sum is σ = 51863651298. Its totient is φ = 51863651296.

The previous prime is 51863651267. The next prime is 51863651309. The reversal of 51863651297 is 79215636815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46138610401 + 5725040896 = 214799^2 + 75664^2 .

It is a cyclic number.

It is not a de Polignac number, because 51863651297 - 2⁶ = 51863651233 is a prime.

It is not a weakly prime, because it can be changed into another prime (51863651267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25931825648 + 25931825649.

It is an arithmetic number, because the mean of its divisors is an integer number (25931825649).

Almost surely, 2^51863651297 is an apocalyptic number.

It is an amenable number.

51863651297 is a deficient number, since it is larger than the sum of its proper divisors (1).

51863651297 is an equidigital number, since it uses as much as digits as its factorization.

51863651297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 53.

The spelling of 51863651297 in words is "fifty-one billion, eight hundred sixty-three million, six hundred fifty-one thousand, two hundred ninety-seven".