188351342521 has 4 divisors (see below), whose sum is σ = 190931497972. Its totient is φ = 185771187072.

The previous prime is 188351342483. The next prime is 188351342527. The reversal of 188351342521 is 125243153881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125243153881 = 160817 ⋅778793.

It can be written as a sum of positive squares in 2 ways, for example, as 145652906025 + 42698436496 = 381645^2 + 206636^2 .

It is a cyclic number.

It is not a de Polignac number, because 188351342521 - 2¹³ = 188351334329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188351342527) 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, 1290077616 + ... + 1290077761.

It is an arithmetic number, because the mean of its divisors is an integer number (47732874493).

Almost surely, 2^188351342521 is an apocalyptic number.

It is an amenable number.

188351342521 is a deficient number, since it is larger than the sum of its proper divisors (2580155451).

188351342521 is an equidigital number, since it uses as much as digits as its factorization.

188351342521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580155450.

The product of its digits is 230400, while the sum is 43.

The spelling of 188351342521 in words is "one hundred eighty-eight billion, three hundred fifty-one million, three hundred forty-two thousand, five hundred twenty-one".