25171649011 has 2 divisors, whose sum is σ = 25171649012. Its totient is φ = 25171649010.

The previous prime is 25171648993. The next prime is 25171649023. The reversal of 25171649011 is 11094617152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25171649011 - 2⁹ = 25171648499 is a prime.

It is a super-2 number, since 2×25171649011² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25171649311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585824505 + 12585824506.

It is an arithmetic number, because the mean of its divisors is an integer number (12585824506).

Almost surely, 2^25171649011 is an apocalyptic number.

25171649011 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171649011 is an equidigital number, since it uses as much as digits as its factorization.

25171649011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 25171649011 in words is "twenty-five billion, one hundred seventy-one million, six hundred forty-nine thousand, eleven".