1215644620013 has 2 divisors, whose sum is σ = 1215644620014. Its totient is φ = 1215644620012.

The previous prime is 1215644620007. The next prime is 1215644620033. The reversal of 1215644620013 is 3100264465121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796345633924 + 419298986089 = 892382^2 + 647533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215644620013 - 2⁴ = 1215644619997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215644620033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607822310006 + 607822310007.

It is an arithmetic number, because the mean of its divisors is an integer number (607822310007).

Almost surely, 2^{1215644620013} is an apocalyptic number.

It is an amenable number.

1215644620013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215644620013 is an equidigital number, since it uses as much as digits as its factorization.

1215644620013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 1215644620013 in words is "one trillion, two hundred fifteen billion, six hundred forty-four million, six hundred twenty thousand, thirteen".