25513433437 has 2 divisors, whose sum is σ = 25513433438. Its totient is φ = 25513433436.

The previous prime is 25513433431. The next prime is 25513433441. The reversal of 25513433437 is 73433431552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25512395076 + 1038361 = 159726^2 + 1019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25513433437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25513433437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25513433431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756716718 + 12756716719.

It is an arithmetic number, because the mean of its divisors is an integer number (12756716719).

Almost surely, 2^25513433437 is an apocalyptic number.

It is an amenable number.

25513433437 is a deficient number, since it is larger than the sum of its proper divisors (1).

25513433437 is an equidigital number, since it uses as much as digits as its factorization.

25513433437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 40.

Adding to 25513433437 its reverse (73433431552), we get a palindrome (98946864989).

The spelling of 25513433437 in words is "twenty-five billion, five hundred thirteen million, four hundred thirty-three thousand, four hundred thirty-seven".