215535142123999 has 16 divisors (see below), whose sum is σ = 225173212830720. Its totient is φ = 206065010148480.

The previous prime is 215535142123997. The next prime is 215535142124009. The reversal of 215535142123999 is 999321241535512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215535142123999 - 2¹ = 215535142123997 is a prime.

It is a super-2 number, since 2×215535142123999² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215535142123997) 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, 124649719 + ... + 126367015.

It is an arithmetic number, because the mean of its divisors is an integer number (14073325801920).

Almost surely, 2^{215535142123999} is an apocalyptic number.

215535142123999 is a deficient number, since it is larger than the sum of its proper divisors (9638070706721).

215535142123999 is a wasteful number, since it uses less digits than its factorization.

215535142123999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766190.

The product of its digits is 26244000, while the sum is 61.

The spelling of 215535142123999 in words is "two hundred fifteen trillion, five hundred thirty-five billion, one hundred forty-two million, one hundred twenty-three thousand, nine hundred ninety-nine".