1555001332213 has 4 divisors (see below), whose sum is σ = 1777144379680. Its totient is φ = 1332858284748.

The previous prime is 1555001332127. The next prime is 1555001332243. The reversal of 1555001332213 is 3122331005551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555001332213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555001332243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111071523723 + ... + 111071523736.

It is an arithmetic number, because the mean of its divisors is an integer number (444286094920).

Almost surely, 2^{1555001332213} is an apocalyptic number.

It is an amenable number.

1555001332213 is a deficient number, since it is larger than the sum of its proper divisors (222143047467).

1555001332213 is an equidigital number, since it uses as much as digits as its factorization.

1555001332213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222143047466.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 1555001332213 its reverse (3122331005551), we get a palindrome (4677332337764).

The spelling of 1555001332213 in words is "one trillion, five hundred fifty-five billion, one million, three hundred thirty-two thousand, two hundred thirteen".