51649622797 has 2 divisors, whose sum is σ = 51649622798. Its totient is φ = 51649622796.

The previous prime is 51649622749. The next prime is 51649622803. The reversal of 51649622797 is 79722694615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50997382276 + 652240521 = 225826^2 + 25539^2 .

It is a cyclic number.

It is not a de Polignac number, because 51649622797 - 2³¹ = 49502139149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51649622707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25824811398 + 25824811399.

It is an arithmetic number, because the mean of its divisors is an integer number (25824811399).

Almost surely, 2^51649622797 is an apocalyptic number.

It is an amenable number.

51649622797 is a deficient number, since it is larger than the sum of its proper divisors (1).

51649622797 is an equidigital number, since it uses as much as digits as its factorization.

51649622797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 58.

The spelling of 51649622797 in words is "fifty-one billion, six hundred forty-nine million, six hundred twenty-two thousand, seven hundred ninety-seven".