25978426949 has 2 divisors, whose sum is σ = 25978426950. Its totient is φ = 25978426948.

The previous prime is 25978426931. The next prime is 25978426967. The reversal of 25978426949 is 94962487952.

It is a balanced prime because it is at equal distance from previous prime (25978426931) and next prime (25978426967).

It can be written as a sum of positive squares in only one way, i.e., 22108716100 + 3869710849 = 148690^2 + 62207^2 .

It is a cyclic number.

It is not a de Polignac number, because 25978426949 - 2³² = 21683459653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25978426979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989213474 + 12989213475.

It is an arithmetic number, because the mean of its divisors is an integer number (12989213475).

Almost surely, 2^25978426949 is an apocalyptic number.

It is an amenable number.

25978426949 is a deficient number, since it is larger than the sum of its proper divisors (1).

25978426949 is an equidigital number, since it uses as much as digits as its factorization.

25978426949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 65.

The spelling of 25978426949 in words is "twenty-five billion, nine hundred seventy-eight million, four hundred twenty-six thousand, nine hundred forty-nine".