25478421953213 has 2 divisors, whose sum is σ = 25478421953214. Its totient is φ = 25478421953212.

The previous prime is 25478421953107. The next prime is 25478421953233. The reversal of 25478421953213 is 31235912487452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24529009466329 + 949412486884 = 4952677^2 + 974378^2 .

It is a cyclic number.

It is not a de Polignac number, because 25478421953213 - 2⁸ = 25478421952957 is a prime.

It is a super-2 number, since 2×25478421953213² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25478421953233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12739210976606 + 12739210976607.

It is an arithmetic number, because the mean of its divisors is an integer number (12739210976607).

Almost surely, 2^{25478421953213} is an apocalyptic number.

It is an amenable number.

25478421953213 is a deficient number, since it is larger than the sum of its proper divisors (1).

25478421953213 is an equidigital number, since it uses as much as digits as its factorization.

25478421953213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 56.

The spelling of 25478421953213 in words is "twenty-five trillion, four hundred seventy-eight billion, four hundred twenty-one million, nine hundred fifty-three thousand, two hundred thirteen".