1540221013636 has 6 divisors (see below), whose sum is σ = 2695386773870. Its totient is φ = 770110506816.

The previous prime is 1540221013619. The next prime is 1540221013697. The reversal of 1540221013636 is 6363101220451.

It can be written as a sum of positive squares in only one way, i.e., 1079375544900 + 460845468736 = 1038930^2 + 678856^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192527626701 + ... + 192527626708.

Almost surely, 2^{1540221013636} is an apocalyptic number.

It is an amenable number.

1540221013636 is a deficient number, since it is larger than the sum of its proper divisors (1155165760234).

1540221013636 is a wasteful number, since it uses less digits than its factorization.

1540221013636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385055253413 (or 385055253411 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 1540221013636 in words is "one trillion, five hundred forty billion, two hundred twenty-one million, thirteen thousand, six hundred thirty-six".