251542506533 has 2 divisors, whose sum is σ = 251542506534. Its totient is φ = 251542506532.

The previous prime is 251542506463. The next prime is 251542506541. The reversal of 251542506533 is 335605245152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225304014244 + 26238492289 = 474662^2 + 161983^2 .

It is a cyclic number.

It is not a de Polignac number, because 251542506533 - 2¹⁴ = 251542490149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251542506233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125771253266 + 125771253267.

It is an arithmetic number, because the mean of its divisors is an integer number (125771253267).

Almost surely, 2^251542506533 is an apocalyptic number.

It is an amenable number.

251542506533 is a deficient number, since it is larger than the sum of its proper divisors (1).

251542506533 is an equidigital number, since it uses as much as digits as its factorization.

251542506533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 251542506533 in words is "two hundred fifty-one billion, five hundred forty-two million, five hundred six thousand, five hundred thirty-three".