187542557393 has 2 divisors, whose sum is σ = 187542557394. Its totient is φ = 187542557392.

The previous prime is 187542557381. The next prime is 187542557401. The reversal of 187542557393 is 393755245781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139391715904 + 48150841489 = 373352^2 + 219433^2 .

It is a cyclic number.

It is not a de Polignac number, because 187542557393 - 2²⁶ = 187475448529 is a prime.

It is not a weakly prime, because it can be changed into another prime (187542557593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93771278696 + 93771278697.

It is an arithmetic number, because the mean of its divisors is an integer number (93771278697).

Almost surely, 2^187542557393 is an apocalyptic number.

It is an amenable number.

187542557393 is a deficient number, since it is larger than the sum of its proper divisors (1).

187542557393 is an equidigital number, since it uses as much as digits as its factorization.

187542557393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752000, while the sum is 59.

The spelling of 187542557393 in words is "one hundred eighty-seven billion, five hundred forty-two million, five hundred fifty-seven thousand, three hundred ninety-three".