1216446425461 has 2 divisors, whose sum is σ = 1216446425462. Its totient is φ = 1216446425460.

The previous prime is 1216446425413. The next prime is 1216446425477. The reversal of 1216446425461 is 1645246446121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134768215025 + 81678210436 = 1065255^2 + 285794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216446425461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216446455461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608223212730 + 608223212731.

It is an arithmetic number, because the mean of its divisors is an integer number (608223212731).

Almost surely, 2^{1216446425461} is an apocalyptic number.

It is an amenable number.

1216446425461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216446425461 is an equidigital number, since it uses as much as digits as its factorization.

1216446425461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 46.

The spelling of 1216446425461 in words is "one trillion, two hundred sixteen billion, four hundred forty-six million, four hundred twenty-five thousand, four hundred sixty-one".