25506737 has 2 divisors, whose sum is σ = 25506738. Its totient is φ = 25506736.

The previous prime is 25506673. The next prime is 25506739. The reversal of 25506737 is 73760552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24216241 + 1290496 = 4921^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 25506737 - 2⁶ = 25506673 is a prime.

Together with 25506739, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25506697 and 25506706.

It is not a weakly prime, because it can be changed into another prime (25506739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753368 + 12753369.

It is an arithmetic number, because the mean of its divisors is an integer number (12753369).

Almost surely, 2^25506737 is an apocalyptic number.

It is an amenable number.

25506737 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506737 is an equidigital number, since it uses as much as digits as its factorization.

25506737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 35.

The square root of 25506737 is about 5050.4194875277. The cubic root of 25506737 is about 294.3641845669.

The spelling of 25506737 in words is "twenty-five million, five hundred six thousand, seven hundred thirty-seven".