42166532251 has 2 divisors, whose sum is σ = 42166532252. Its totient is φ = 42166532250.

The previous prime is 42166532207. The next prime is 42166532257. The reversal of 42166532251 is 15223566124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42166532251 - 2⁹ = 42166531739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42166532251.

It is not a weakly prime, because it can be changed into another prime (42166532257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21083266125 + 21083266126.

It is an arithmetic number, because the mean of its divisors is an integer number (21083266126).

Almost surely, 2^42166532251 is an apocalyptic number.

42166532251 is a deficient number, since it is larger than the sum of its proper divisors (1).

42166532251 is an equidigital number, since it uses as much as digits as its factorization.

42166532251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 37.

The spelling of 42166532251 in words is "forty-two billion, one hundred sixty-six million, five hundred thirty-two thousand, two hundred fifty-one".