123534125571 has 4 divisors (see below), whose sum is σ = 164712167432. Its totient is φ = 82356083712.

The previous prime is 123534125537. The next prime is 123534125593. The reversal of 123534125571 is 175521435321.

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

It is not a de Polignac number, because 123534125571 - 2⁷ = 123534125443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123534125371) 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, 20589020926 + ... + 20589020931.

It is an arithmetic number, because the mean of its divisors is an integer number (41178041858).

Almost surely, 2^123534125571 is an apocalyptic number.

123534125571 is a deficient number, since it is larger than the sum of its proper divisors (41178041861).

123534125571 is an equidigital number, since it uses as much as digits as its factorization.

123534125571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41178041860.

The product of its digits is 126000, while the sum is 39.

The spelling of 123534125571 in words is "one hundred twenty-three billion, five hundred thirty-four million, one hundred twenty-five thousand, five hundred seventy-one".