1215511550453 has 2 divisors, whose sum is σ = 1215511550454. Its totient is φ = 1215511550452.

The previous prime is 1215511550447. The next prime is 1215511550467. The reversal of 1215511550453 is 3540551155121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169808806929 + 45702743524 = 1081577^2 + 213782^2 .

It is an emirp because it is prime and its reverse (3540551155121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215511550453 - 2⁴ = 1215511550437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215511550483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607755775226 + 607755775227.

It is an arithmetic number, because the mean of its divisors is an integer number (607755775227).

Almost surely, 2^{1215511550453} is an apocalyptic number.

It is an amenable number.

1215511550453 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215511550453 is an equidigital number, since it uses as much as digits as its factorization.

1215511550453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75000, while the sum is 38.

The spelling of 1215511550453 in words is "one trillion, two hundred fifteen billion, five hundred eleven million, five hundred fifty thousand, four hundred fifty-three".