5215666123 has 4 divisors (see below), whose sum is σ = 5336960728. Its totient is φ = 5094371520.

The previous prime is 5215666097. The next prime is 5215666151. The reversal of 5215666123 is 3216665125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5215666123 is a prime.

It is a super-2 number, since 2×5215666123² = 54406346213219702258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5215666163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60647238 + ... + 60647323.

It is an arithmetic number, because the mean of its divisors is an integer number (1334240182).

Almost surely, 2^5215666123 is an apocalyptic number.

5215666123 is a deficient number, since it is larger than the sum of its proper divisors (121294605).

5215666123 is a wasteful number, since it uses less digits than its factorization.

5215666123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121294604.

The product of its digits is 64800, while the sum is 37.

The square root of 5215666123 is about 72219.5688369849. The cubic root of 5215666123 is about 1734.2162879903.

The spelling of 5215666123 in words is "five billion, two hundred fifteen million, six hundred sixty-six thousand, one hundred twenty-three".