51612747449 has 2 divisors, whose sum is σ = 51612747450. Its totient is φ = 51612747448.

The previous prime is 51612747413. The next prime is 51612747457. The reversal of 51612747449 is 94474721615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28911901225 + 22700846224 = 170035^2 + 150668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51612747449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51612747397 and 51612747406.

It is not a weakly prime, because it can be changed into another prime (51612747499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25806373724 + 25806373725.

It is an arithmetic number, because the mean of its divisors is an integer number (25806373725).

Almost surely, 2^51612747449 is an apocalyptic number.

It is an amenable number.

51612747449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51612747449 is an equidigital number, since it uses as much as digits as its factorization.

51612747449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 50.

The spelling of 51612747449 in words is "fifty-one billion, six hundred twelve million, seven hundred forty-seven thousand, four hundred forty-nine".