18425778677 has 2 divisors, whose sum is σ = 18425778678. Its totient is φ = 18425778676.

The previous prime is 18425778649. The next prime is 18425778731. The reversal of 18425778677 is 77687752481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18368109841 + 57668836 = 135529^2 + 7594^2 .

It is a cyclic number.

It is not a de Polignac number, because 18425778677 - 2¹⁰ = 18425777653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18425778577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212889338 + 9212889339.

It is an arithmetic number, because the mean of its divisors is an integer number (9212889339).

Almost surely, 2^18425778677 is an apocalyptic number.

It is an amenable number.

18425778677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18425778677 is an equidigital number, since it uses as much as digits as its factorization.

18425778677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36879360, while the sum is 62.

The spelling of 18425778677 in words is "eighteen billion, four hundred twenty-five million, seven hundred seventy-eight thousand, six hundred seventy-seven".