51784209679 has 2 divisors, whose sum is σ = 51784209680. Its totient is φ = 51784209678.

The previous prime is 51784209667. The next prime is 51784209683. The reversal of 51784209679 is 97690248715.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51784209679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51784209689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25892104839 + 25892104840.

It is an arithmetic number, because the mean of its divisors is an integer number (25892104840).

Almost surely, 2^51784209679 is an apocalyptic number.

51784209679 is a deficient number, since it is larger than the sum of its proper divisors (1).

51784209679 is an equidigital number, since it uses as much as digits as its factorization.

51784209679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 51784209679 in words is "fifty-one billion, seven hundred eighty-four million, two hundred nine thousand, six hundred seventy-nine".