25720750061 has 2 divisors, whose sum is σ = 25720750062. Its totient is φ = 25720750060.

The previous prime is 25720750031. The next prime is 25720750067. The reversal of 25720750061 is 16005702752.

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., 20450716036 + 5270034025 = 143006^2 + 72595^2 .

It is a cyclic number.

It is not a de Polignac number, because 25720750061 - 2²² = 25716555757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25720750067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860375030 + 12860375031.

It is an arithmetic number, because the mean of its divisors is an integer number (12860375031).

Almost surely, 2^25720750061 is an apocalyptic number.

It is an amenable number.

25720750061 is a deficient number, since it is larger than the sum of its proper divisors (1).

25720750061 is an equidigital number, since it uses as much as digits as its factorization.

25720750061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 35.

The spelling of 25720750061 in words is "twenty-five billion, seven hundred twenty million, seven hundred fifty thousand, sixty-one".