1370666115521 has 2 divisors, whose sum is σ = 1370666115522. Its totient is φ = 1370666115520.

The previous prime is 1370666115463. The next prime is 1370666115523. The reversal of 1370666115521 is 1255116660731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1262746638400 + 107919477121 = 1123720^2 + 328511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1370666115521 - 2¹⁰ = 1370666114497 is a prime.

Together with 1370666115523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1370666115523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685333057760 + 685333057761.

It is an arithmetic number, because the mean of its divisors is an integer number (685333057761).

Almost surely, 2^{1370666115521} is an apocalyptic number.

It is an amenable number.

1370666115521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1370666115521 is an equidigital number, since it uses as much as digits as its factorization.

1370666115521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 1370666115521 in words is "one trillion, three hundred seventy billion, six hundred sixty-six million, one hundred fifteen thousand, five hundred twenty-one".