25849886849 has 2 divisors, whose sum is σ = 25849886850. Its totient is φ = 25849886848.

The previous prime is 25849886833. The next prime is 25849886873. The reversal of 25849886849 is 94868894852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17629200625 + 8220686224 = 132775^2 + 90668^2 .

It is a cyclic number.

It is not a de Polignac number, because 25849886849 - 2⁴ = 25849886833 is a prime.

It is a super-2 number, since 2×25849886849² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25849886879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12924943424 + 12924943425.

It is an arithmetic number, because the mean of its divisors is an integer number (12924943425).

Almost surely, 2^25849886849 is an apocalyptic number.

It is an amenable number.

25849886849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25849886849 is an equidigital number, since it uses as much as digits as its factorization.

25849886849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 318504960, while the sum is 71.

The spelling of 25849886849 in words is "twenty-five billion, eight hundred forty-nine million, eight hundred eighty-six thousand, eight hundred forty-nine".