25494697489 has 4 divisors (see below), whose sum is σ = 25500012580. Its totient is φ = 25489382400.

The previous prime is 25494697483. The next prime is 25494697511. The reversal of 25494697489 is 98479649452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20788737489 + 4705960000 = 144183^2 + 68600^2 .

It is a cyclic number.

It is not a de Polignac number, because 25494697489 - 2⁵ = 25494697457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25494697483) 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 3 ways as a sum of consecutive naturals, for example, 2650344 + ... + 2659945.

It is an arithmetic number, because the mean of its divisors is an integer number (6375003145).

Almost surely, 2^25494697489 is an apocalyptic number.

It is an amenable number.

25494697489 is a deficient number, since it is larger than the sum of its proper divisors (5315091).

25494697489 is an equidigital number, since it uses as much as digits as its factorization.

25494697489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315090.

The product of its digits is 156764160, while the sum is 67.

The spelling of 25494697489 in words is "twenty-five billion, four hundred ninety-four million, six hundred ninety-seven thousand, four hundred eighty-nine".