51774451639 has 2 divisors, whose sum is σ = 51774451640. Its totient is φ = 51774451638.

The previous prime is 51774451583. The next prime is 51774451649. The reversal of 51774451639 is 93615447715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51774451639 - 2⁷ = 51774451511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51774451649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25887225819 + 25887225820.

It is an arithmetic number, because the mean of its divisors is an integer number (25887225820).

Almost surely, 2^51774451639 is an apocalyptic number.

51774451639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51774451639 is an equidigital number, since it uses as much as digits as its factorization.

51774451639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 52.

The spelling of 51774451639 in words is "fifty-one billion, seven hundred seventy-four million, four hundred fifty-one thousand, six hundred thirty-nine".