25015038386861 has 2 divisors, whose sum is σ = 25015038386862. Its totient is φ = 25015038386860.

The previous prime is 25015038386773. The next prime is 25015038386887. The reversal of 25015038386861 is 16868383051052.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19911139596100 + 5103898790761 = 4462190^2 + 2259181^2 .

It is a cyclic number.

It is not a de Polignac number, because 25015038386861 - 2¹⁰ = 25015038385837 is a prime.

It is a super-2 number, since 2×25015038386861² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25015038386797 and 25015038386806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25015038086861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12507519193430 + 12507519193431.

It is an arithmetic number, because the mean of its divisors is an integer number (12507519193431).

Almost surely, 2^{25015038386861} is an apocalyptic number.

It is an amenable number.

25015038386861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25015038386861 is an equidigital number, since it uses as much as digits as its factorization.

25015038386861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 25015038386861 in words is "twenty-five trillion, fifteen billion, thirty-eight million, three hundred eighty-six thousand, eight hundred sixty-one".