51005009647 has 2 divisors, whose sum is σ = 51005009648. Its totient is φ = 51005009646.

The previous prime is 51005009641. The next prime is 51005009663. The reversal of 51005009647 is 74690050015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51005009647 - 2¹⁹ = 51004485359 is a prime.

It is a super-2 number, since 2×51005009647² (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 (51005009641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25502504823 + 25502504824.

It is an arithmetic number, because the mean of its divisors is an integer number (25502504824).

Almost surely, 2^51005009647 is an apocalyptic number.

51005009647 is a deficient number, since it is larger than the sum of its proper divisors (1).

51005009647 is an equidigital number, since it uses as much as digits as its factorization.

51005009647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 51005009647 in words is "fifty-one billion, five million, nine thousand, six hundred forty-seven".