25006402409 has 2 divisors, whose sum is σ = 25006402410. Its totient is φ = 25006402408.

The previous prime is 25006402391. The next prime is 25006402439. The reversal of 25006402409 is 90420460052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15031986025 + 9974416384 = 122605^2 + 99872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25006402409 is a prime.

It is a super-2 number, since 2×25006402409² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25006402439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12503201204 + 12503201205.

It is an arithmetic number, because the mean of its divisors is an integer number (12503201205).

Almost surely, 2^25006402409 is an apocalyptic number.

It is an amenable number.

25006402409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25006402409 is an equidigital number, since it uses as much as digits as its factorization.

25006402409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 25006402409 in words is "twenty-five billion, six million, four hundred two thousand, four hundred nine".