25731505673 has 2 divisors, whose sum is σ = 25731505674. Its totient is φ = 25731505672.

The previous prime is 25731505661. The next prime is 25731505717. The reversal of 25731505673 is 37650513752.

It is an a-pointer prime, because the next prime (25731505717) can be obtained adding 25731505673 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24851315449 + 880190224 = 157643^2 + 29668^2 .

It is a cyclic number.

It is not a de Polignac number, because 25731505673 - 2¹² = 25731501577 is a prime.

It is a super-2 number, since 2×25731505673² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25731505273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12865752836 + 12865752837.

It is an arithmetic number, because the mean of its divisors is an integer number (12865752837).

Almost surely, 2^25731505673 is an apocalyptic number.

It is an amenable number.

25731505673 is a deficient number, since it is larger than the sum of its proper divisors (1).

25731505673 is an equidigital number, since it uses as much as digits as its factorization.

25731505673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 661500, while the sum is 44.

The spelling of 25731505673 in words is "twenty-five billion, seven hundred thirty-one million, five hundred five thousand, six hundred seventy-three".