25199372281 has 2 divisors, whose sum is σ = 25199372282. Its totient is φ = 25199372280.

The previous prime is 25199372273. The next prime is 25199372291. The reversal of 25199372281 is 18227399152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23626456681 + 1572915600 = 153709^2 + 39660^2 .

It is a cyclic number.

It is not a de Polignac number, because 25199372281 - 2³ = 25199372273 is a prime.

It is a super-2 number, since 2×25199372281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25199372291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12599686140 + 12599686141.

It is an arithmetic number, because the mean of its divisors is an integer number (12599686141).

Almost surely, 2^25199372281 is an apocalyptic number.

It is an amenable number.

25199372281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25199372281 is an equidigital number, since it uses as much as digits as its factorization.

25199372281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The spelling of 25199372281 in words is "twenty-five billion, one hundred ninety-nine million, three hundred seventy-two thousand, two hundred eighty-one".