1215157679423 has 2 divisors, whose sum is σ = 1215157679424. Its totient is φ = 1215157679422.

The previous prime is 1215157679413. The next prime is 1215157679471. The reversal of 1215157679423 is 3249767515121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215157679423 - 2⁸ = 1215157679167 is a prime.

It is a super-2 number, since 2×1215157679423² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215157679413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607578839711 + 607578839712.

It is an arithmetic number, because the mean of its divisors is an integer number (607578839712).

Almost surely, 2^{1215157679423} is an apocalyptic number.

1215157679423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215157679423 is an equidigital number, since it uses as much as digits as its factorization.

1215157679423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 53.

The spelling of 1215157679423 in words is "one trillion, two hundred fifteen billion, one hundred fifty-seven million, six hundred seventy-nine thousand, four hundred twenty-three".