51669505439 has 2 divisors, whose sum is σ = 51669505440. Its totient is φ = 51669505438.

The previous prime is 51669505429. The next prime is 51669505457. The reversal of 51669505439 is 93450596615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51669505439 - 2¹² = 51669501343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51669505429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25834752719 + 25834752720.

It is an arithmetic number, because the mean of its divisors is an integer number (25834752720).

Almost surely, 2^51669505439 is an apocalyptic number.

51669505439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51669505439 is an equidigital number, since it uses as much as digits as its factorization.

51669505439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374000, while the sum is 53.

The spelling of 51669505439 in words is "fifty-one billion, six hundred sixty-nine million, five hundred five thousand, four hundred thirty-nine".