2555138693 has 2 divisors, whose sum is σ = 2555138694. Its totient is φ = 2555138692.

The previous prime is 2555138689. The next prime is 2555138713. The reversal of 2555138693 is 3968315552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2533914244 + 21224449 = 50338^2 + 4607^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555138693 - 2² = 2555138689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555138603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277569346 + 1277569347.

It is an arithmetic number, because the mean of its divisors is an integer number (1277569347).

Almost surely, 2^2555138693 is an apocalyptic number.

It is an amenable number.

2555138693 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555138693 is an equidigital number, since it uses as much as digits as its factorization.

2555138693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 47.

The square root of 2555138693 is about 50548.3797267529. The cubic root of 2555138693 is about 1367.1143005284.

The spelling of 2555138693 in words is "two billion, five hundred fifty-five million, one hundred thirty-eight thousand, six hundred ninety-three".