51299864501749 has 2 divisors, whose sum is σ = 51299864501750. Its totient is φ = 51299864501748.

The previous prime is 51299864501693. The next prime is 51299864501761. The reversal of 51299864501749 is 94710546899215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40312429528849 + 10987434972900 = 6349207^2 + 3314730^2 .

It is a cyclic number.

It is not a de Polignac number, because 51299864501749 - 2³³ = 51291274567157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51299864531749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25649932250874 + 25649932250875.

It is an arithmetic number, because the mean of its divisors is an integer number (25649932250875).

Almost surely, 2^{51299864501749} is an apocalyptic number.

It is an amenable number.

51299864501749 is a deficient number, since it is larger than the sum of its proper divisors (1).

51299864501749 is an equidigital number, since it uses as much as digits as its factorization.

51299864501749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 195955200, while the sum is 70.

The spelling of 51299864501749 in words is "fifty-one trillion, two hundred ninety-nine billion, eight hundred sixty-four million, five hundred one thousand, seven hundred forty-nine".