25777993 has 2 divisors, whose sum is σ = 25777994. Its totient is φ = 25777992.

The previous prime is 25777943. The next prime is 25778021. The reversal of 25777993 is 39977752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19686969 + 6091024 = 4437^2 + 2468^2 .

It is a cyclic number.

It is not a de Polignac number, because 25777993 - 2²¹ = 23680841 is a prime.

It is not a weakly prime, because it can be changed into another prime (25777903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12888996 + 12888997.

It is an arithmetic number, because the mean of its divisors is an integer number (12888997).

Almost surely, 2^25777993 is an apocalyptic number.

It is an amenable number.

25777993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25777993 is an equidigital number, since it uses as much as digits as its factorization.

25777993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 833490, while the sum is 49.

The square root of 25777993 is about 5077.2032655784. The cubic root of 25777993 is about 295.4039968979.

The spelling of 25777993 in words is "twenty-five million, seven hundred seventy-seven thousand, nine hundred ninety-three".