261123272803 has 2 divisors, whose sum is σ = 261123272804. Its totient is φ = 261123272802.

The previous prime is 261123272801. The next prime is 261123272807. The reversal of 261123272803 is 308272321162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261123272803 - 2¹ = 261123272801 is a prime.

Together with 261123272801, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261123272801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130561636401 + 130561636402.

It is an arithmetic number, because the mean of its divisors is an integer number (130561636402).

Almost surely, 2^261123272803 is an apocalyptic number.

261123272803 is a deficient number, since it is larger than the sum of its proper divisors (1).

261123272803 is an equidigital number, since it uses as much as digits as its factorization.

261123272803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

Adding to 261123272803 its reverse (308272321162), we get a palindrome (569395593965).

The spelling of 261123272803 in words is "two hundred sixty-one billion, one hundred twenty-three million, two hundred seventy-two thousand, eight hundred three".