1215522500081 has 2 divisors, whose sum is σ = 1215522500082. Its totient is φ = 1215522500080.

The previous prime is 1215522500069. The next prime is 1215522500147. The reversal of 1215522500081 is 1800052255121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211285141056 + 4237359025 = 1100584^2 + 65095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215522500081 - 2²² = 1215518305777 is a prime.

It is a super-3 number, since 3×1215522500081³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1215522500011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607761250040 + 607761250041.

It is an arithmetic number, because the mean of its divisors is an integer number (607761250041).

Almost surely, 2^{1215522500081} is an apocalyptic number.

It is an amenable number.

1215522500081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215522500081 is an equidigital number, since it uses as much as digits as its factorization.

1215522500081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8000, while the sum is 32.

The spelling of 1215522500081 in words is "one trillion, two hundred fifteen billion, five hundred twenty-two million, five hundred thousand, eighty-one".