1215345442523 has 16 divisors (see below), whose sum is σ = 1250050368000. Its totient is φ = 1181137635072.

The previous prime is 1215345442513. The next prime is 1215345442541. The reversal of 1215345442523 is 3252445435121.

It is a cyclic number.

It is not a de Polignac number, because 1215345442523 - 2³⁶ = 1146625965787 is a prime.

It is a super-2 number, since 2×1215345442523² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215345442513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5143898 + ... + 5374976.

It is an arithmetic number, because the mean of its divisors is an integer number (78128148000).

Almost surely, 2^{1215345442523} is an apocalyptic number.

1215345442523 is a deficient number, since it is larger than the sum of its proper divisors (34704925477).

1215345442523 is an equidigital number, since it uses as much as digits as its factorization.

1215345442523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232154.

The product of its digits is 576000, while the sum is 41.

The spelling of 1215345442523 in words is "one trillion, two hundred fifteen billion, three hundred forty-five million, four hundred forty-two thousand, five hundred twenty-three".