1261143354255 has 16 divisors (see below), whose sum is σ = 2028072160224. Its totient is φ = 669195524480.

The previous prime is 1261143354223. The next prime is 1261143354257. The reversal of 1261143354255 is 5524533411621.

It is not a de Polignac number, because 1261143354255 - 2⁵ = 1261143354223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261143354257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213388476 + ... + 213394385.

It is an arithmetic number, because the mean of its divisors is an integer number (126754510014).

Almost surely, 2^{1261143354255} is an apocalyptic number.

1261143354255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1261143354255 is a deficient number, since it is larger than the sum of its proper divisors (766928805969).

1261143354255 is a wasteful number, since it uses less digits than its factorization.

1261143354255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426783066.

The product of its digits is 432000, while the sum is 42.

Adding to 1261143354255 its reverse (5524533411621), we get a palindrome (6785676765876).

The spelling of 1261143354255 in words is "one trillion, two hundred sixty-one billion, one hundred forty-three million, three hundred fifty-four thousand, two hundred fifty-five".