51126755639 has 2 divisors, whose sum is σ = 51126755640. Its totient is φ = 51126755638.

The previous prime is 51126755629. The next prime is 51126755671. The reversal of 51126755639 is 93655762115.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51126755639 is a prime.

It is a super-2 number, since 2×51126755639² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51126755629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25563377819 + 25563377820.

It is an arithmetic number, because the mean of its divisors is an integer number (25563377820).

Almost surely, 2^51126755639 is an apocalyptic number.

51126755639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51126755639 is an equidigital number, since it uses as much as digits as its factorization.

51126755639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 50.

The spelling of 51126755639 in words is "fifty-one billion, one hundred twenty-six million, seven hundred fifty-five thousand, six hundred thirty-nine".