1216071755225 has 6 divisors (see below), whose sum is σ = 1507928976510. Its totient is φ = 972857404160.

The previous prime is 1216071755209. The next prime is 1216071755279. The reversal of 1216071755225 is 5225571706121.

It can be written as a sum of positive squares in 3 ways, for example, as 22707777481 + 1193363977744 = 150691^2 + 1092412^2 .

It is not a de Polignac number, because 1216071755225 - 2⁴ = 1216071755209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24321435080 + ... + 24321435129.

It is an arithmetic number, because the mean of its divisors is an integer number (251321496085).

Almost surely, 2^{1216071755225} is an apocalyptic number.

It is an amenable number.

1216071755225 is a deficient number, since it is larger than the sum of its proper divisors (291857221285).

1216071755225 is an equidigital number, since it uses as much as digits as its factorization.

1216071755225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48642870219 (or 48642870214 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 44.

The spelling of 1216071755225 in words is "one trillion, two hundred sixteen billion, seventy-one million, seven hundred fifty-five thousand, two hundred twenty-five".