261450408853 has 2 divisors, whose sum is σ = 261450408854. Its totient is φ = 261450408852.

The previous prime is 261450408841. The next prime is 261450408887. The reversal of 261450408853 is 358804054162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188597381284 + 72853027569 = 434278^2 + 269913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261450408853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261450408833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130725204426 + 130725204427.

It is an arithmetic number, because the mean of its divisors is an integer number (130725204427).

Almost surely, 2^261450408853 is an apocalyptic number.

It is an amenable number.

261450408853 is a deficient number, since it is larger than the sum of its proper divisors (1).

261450408853 is an equidigital number, since it uses as much as digits as its factorization.

261450408853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 261450408853 in words is "two hundred sixty-one billion, four hundred fifty million, four hundred eight thousand, eight hundred fifty-three".