1366530721033 has 4 divisors (see below), whose sum is σ = 1367384270868. Its totient is φ = 1365677171200.

The previous prime is 1366530720983. The next prime is 1366530721043. The reversal of 1366530721033 is 3301270356631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1308809217024 + 57721504009 = 1144032^2 + 240253^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366530721033 - 2²⁹ = 1365993850121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1366530721043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426772516 + ... + 426775717.

It is an arithmetic number, because the mean of its divisors is an integer number (341846067717).

Almost surely, 2^{1366530721033} is an apocalyptic number.

It is an amenable number.

1366530721033 is a deficient number, since it is larger than the sum of its proper divisors (853549835).

1366530721033 is an equidigital number, since it uses as much as digits as its factorization.

1366530721033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853549834.

The product of its (nonzero) digits is 204120, while the sum is 40.

The spelling of 1366530721033 in words is "one trillion, three hundred sixty-six billion, five hundred thirty million, seven hundred twenty-one thousand, thirty-three".