25343513491 has 2 divisors, whose sum is σ = 25343513492. Its totient is φ = 25343513490.

The previous prime is 25343513473. The next prime is 25343513509. The reversal of 25343513491 is 19431534352.

It is a balanced prime because it is at equal distance from previous prime (25343513473) and next prime (25343513509).

It is a cyclic number.

It is not a de Polignac number, because 25343513491 - 2¹¹ = 25343511443 is a prime.

It is a super-3 number, since 3×25343513491³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25343513431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12671756745 + 12671756746.

It is an arithmetic number, because the mean of its divisors is an integer number (12671756746).

Almost surely, 2^25343513491 is an apocalyptic number.

25343513491 is a deficient number, since it is larger than the sum of its proper divisors (1).

25343513491 is an equidigital number, since it uses as much as digits as its factorization.

25343513491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 40.

The spelling of 25343513491 in words is "twenty-five billion, three hundred forty-three million, five hundred thirteen thousand, four hundred ninety-one".