51025903639 has 2 divisors, whose sum is σ = 51025903640. Its totient is φ = 51025903638.

The previous prime is 51025903633. The next prime is 51025903657. The reversal of 51025903639 is 93630952015.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51025903639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51025903595 and 51025903604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51025903633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25512951819 + 25512951820.

It is an arithmetic number, because the mean of its divisors is an integer number (25512951820).

Almost surely, 2^51025903639 is an apocalyptic number.

51025903639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51025903639 is an equidigital number, since it uses as much as digits as its factorization.

51025903639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 43.

The spelling of 51025903639 in words is "fifty-one billion, twenty-five million, nine hundred three thousand, six hundred thirty-nine".