25473537409 has 4 divisors (see below), whose sum is σ = 26971980804. Its totient is φ = 23975094016.

The previous prime is 25473537337. The next prime is 25473537437. The reversal of 25473537409 is 90473537452.

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 23639985009 + 1833552400 = 153753^2 + 42820^2 .

It is not a de Polignac number, because 25473537409 - 2⁹ = 25473536897 is a prime.

It is a super-2 number, since 2×25473537409² (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 (25473537469) 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, 749221672 + ... + 749221705.

It is an arithmetic number, because the mean of its divisors is an integer number (6742995201).

Almost surely, 2^25473537409 is an apocalyptic number.

It is an amenable number.

25473537409 is a deficient number, since it is larger than the sum of its proper divisors (1498443395).

25473537409 is a wasteful number, since it uses less digits than its factorization.

25473537409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498443394.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 25473537409 in words is "twenty-five billion, four hundred seventy-three million, five hundred thirty-seven thousand, four hundred nine".