51604635559 has 2 divisors, whose sum is σ = 51604635560. Its totient is φ = 51604635558.

The previous prime is 51604635517. The next prime is 51604635581. The reversal of 51604635559 is 95553640615.

51604635559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51604635559 is a prime.

It is a super-2 number, since 2×51604635559² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51604632559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25802317779 + 25802317780.

It is an arithmetic number, because the mean of its divisors is an integer number (25802317780).

Almost surely, 2^51604635559 is an apocalyptic number.

51604635559 is a deficient number, since it is larger than the sum of its proper divisors (1).

51604635559 is an equidigital number, since it uses as much as digits as its factorization.

51604635559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 51604635559 in words is "fifty-one billion, six hundred four million, six hundred thirty-five thousand, five hundred fifty-nine".