51619666789 has 2 divisors, whose sum is σ = 51619666790. Its totient is φ = 51619666788.

The previous prime is 51619666753. The next prime is 51619666807. The reversal of 51619666789 is 98766691615.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27785556100 + 23834110689 = 166690^2 + 154383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51619666789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51619666789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51619666289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25809833394 + 25809833395.

It is an arithmetic number, because the mean of its divisors is an integer number (25809833395).

Almost surely, 2^51619666789 is an apocalyptic number.

It is an amenable number.

51619666789 is a deficient number, since it is larger than the sum of its proper divisors (1).

51619666789 is an equidigital number, since it uses as much as digits as its factorization.

51619666789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 64.

The spelling of 51619666789 in words is "fifty-one billion, six hundred nineteen million, six hundred sixty-six thousand, seven hundred eighty-nine".