25112165501 has 2 divisors, whose sum is σ = 25112165502. Its totient is φ = 25112165500.

The previous prime is 25112165483. The next prime is 25112165557. The reversal of 25112165501 is 10556121152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15270533476 + 9841632025 = 123574^2 + 99205^2 .

It is a cyclic number.

It is not a de Polignac number, because 25112165501 - 2¹⁰ = 25112164477 is a prime.

It is a super-2 number, since 2×25112165501² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25112165101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12556082750 + 12556082751.

It is an arithmetic number, because the mean of its divisors is an integer number (12556082751).

Almost surely, 2^25112165501 is an apocalyptic number.

It is an amenable number.

25112165501 is a deficient number, since it is larger than the sum of its proper divisors (1).

25112165501 is an equidigital number, since it uses as much as digits as its factorization.

25112165501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 29.

Adding to 25112165501 its reverse (10556121152), we get a palindrome (35668286653).

The spelling of 25112165501 in words is "twenty-five billion, one hundred twelve million, one hundred sixty-five thousand, five hundred one".