1216741626261 has 12 divisors (see below), whose sum is σ = 2008589351392. Its totient is φ = 695280929256.

The previous prime is 1216741626239. The next prime is 1216741626421. The reversal of 1216741626261 is 1626261476121.

1216741626261 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 7 + 4 + 16 + 2 + 626 + 1 = 666.

It is not a de Polignac number, because 1216741626261 - 2²² = 1216737431957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216741621261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9656679511 + ... + 9656679636.

Almost surely, 2^{1216741626261} is an apocalyptic number.

It is an amenable number.

1216741626261 is a deficient number, since it is larger than the sum of its proper divisors (791847725131).

1216741626261 is a wasteful number, since it uses less digits than its factorization.

1216741626261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19313359160 (or 19313359157 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 1216741626261 in words is "one trillion, two hundred sixteen billion, seven hundred forty-one million, six hundred twenty-six thousand, two hundred sixty-one".