261934269052453 has 2 divisors, whose sum is σ = 261934269052454. Its totient is φ = 261934269052452.

The previous prime is 261934269052441. The next prime is 261934269052499. The reversal of 261934269052453 is 354250962439162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256753737990369 + 5180531062084 = 16023537^2 + 2276078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261934269052453 is a prime.

It is a super-2 number, since 2×261934269052453² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261934269052391 and 261934269052400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261934269052433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130967134526226 + 130967134526227.

It is an arithmetic number, because the mean of its divisors is an integer number (130967134526227).

Almost surely, 2^{261934269052453} is an apocalyptic number.

It is an amenable number.

261934269052453 is a deficient number, since it is larger than the sum of its proper divisors (1).

261934269052453 is an equidigital number, since it uses as much as digits as its factorization.

261934269052453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83980800, while the sum is 61.

The spelling of 261934269052453 in words is "two hundred sixty-one trillion, nine hundred thirty-four billion, two hundred sixty-nine million, fifty-two thousand, four hundred fifty-three".