51662256497 has 2 divisors, whose sum is σ = 51662256498. Its totient is φ = 51662256496.

The previous prime is 51662256463. The next prime is 51662256533. The reversal of 51662256497 is 79465226615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43240707136 + 8421549361 = 207944^2 + 91769^2 .

It is a cyclic number.

It is not a de Polignac number, because 51662256497 - 2⁶ = 51662256433 is a prime.

It is a super-2 number, since 2×51662256497² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51662253497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831128248 + 25831128249.

It is an arithmetic number, because the mean of its divisors is an integer number (25831128249).

Almost surely, 2^51662256497 is an apocalyptic number.

It is an amenable number.

51662256497 is a deficient number, since it is larger than the sum of its proper divisors (1).

51662256497 is an equidigital number, since it uses as much as digits as its factorization.

51662256497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 53.

The spelling of 51662256497 in words is "fifty-one billion, six hundred sixty-two million, two hundred fifty-six thousand, four hundred ninety-seven".