25353779977 has 2 divisors, whose sum is σ = 25353779978. Its totient is φ = 25353779976.

The previous prime is 25353779963. The next prime is 25353780031. The reversal of 25353779977 is 77997735352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15898940281 + 9454839696 = 126091^2 + 97236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25353779977 is a prime.

It is a super-2 number, since 2×25353779977² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25353779677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12676889988 + 12676889989.

It is an arithmetic number, because the mean of its divisors is an integer number (12676889989).

Almost surely, 2^25353779977 is an apocalyptic number.

It is an amenable number.

25353779977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25353779977 is an equidigital number, since it uses as much as digits as its factorization.

25353779977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87516450, while the sum is 64.

The spelling of 25353779977 in words is "twenty-five billion, three hundred fifty-three million, seven hundred seventy-nine thousand, nine hundred seventy-seven".