1261153131116 has 48 divisors (see below), whose sum is σ = 2297059914240. Its totient is φ = 605118071040.

The previous prime is 1261153131079. The next prime is 1261153131131. The reversal of 1261153131116 is 6111313511621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76671605 + ... + 76688051.

It is an arithmetic number, because the mean of its divisors is an integer number (47855414880).

Almost surely, 2^{1261153131116} is an apocalyptic number.

It is an amenable number.

1261153131116 is a deficient number, since it is larger than the sum of its proper divisors (1035906783124).

1261153131116 is a wasteful number, since it uses less digits than its factorization.

1261153131116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20474 (or 20472 counting only the distinct ones).

The product of its digits is 3240, while the sum is 32.

Adding to 1261153131116 its reverse (6111313511621), we get a palindrome (7372466642737).

The spelling of 1261153131116 in words is "one trillion, two hundred sixty-one billion, one hundred fifty-three million, one hundred thirty-one thousand, one hundred sixteen".