261449248757 has 2 divisors, whose sum is σ = 261449248758. Its totient is φ = 261449248756.

The previous prime is 261449248727. The next prime is 261449248769. The reversal of 261449248757 is 757842944162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253603895281 + 7845353476 = 503591^2 + 88574^2 .

It is a cyclic number.

It is not a de Polignac number, because 261449248757 - 2⁶ = 261449248693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261449248696 and 261449248705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261449248717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130724624378 + 130724624379.

It is an arithmetic number, because the mean of its divisors is an integer number (130724624379).

Almost surely, 2^261449248757 is an apocalyptic number.

It is an amenable number.

261449248757 is a deficient number, since it is larger than the sum of its proper divisors (1).

261449248757 is an equidigital number, since it uses as much as digits as its factorization.

261449248757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27095040, while the sum is 59.

The spelling of 261449248757 in words is "two hundred sixty-one billion, four hundred forty-nine million, two hundred forty-eight thousand, seven hundred fifty-seven".