25158198689 has 6 divisors (see below), whose sum is σ = 27242310006. Its totient is φ = 23222952480.

The previous prime is 25158198677. The next prime is 25158198739. The reversal of 25158198689 is 98689185152.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 707560000 + 24450638689 = 26600^2 + 156367^2 .

It is not a de Polignac number, because 25158198689 - 2²⁰ = 25157150113 is a prime.

It is a super-2 number, since 2×25158198689² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25158198649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74432372 + ... + 74432709.

It is an arithmetic number, because the mean of its divisors is an integer number (4540385001).

Almost surely, 2^25158198689 is an apocalyptic number.

It is an amenable number.

25158198689 is a deficient number, since it is larger than the sum of its proper divisors (2084111317).

25158198689 is a wasteful number, since it uses less digits than its factorization.

25158198689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148865107 (or 148865094 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 62.

The spelling of 25158198689 in words is "twenty-five billion, one hundred fifty-eight million, one hundred ninety-eight thousand, six hundred eighty-nine".