185142747991 has 2 divisors, whose sum is σ = 185142747992. Its totient is φ = 185142747990.

The previous prime is 185142747929. The next prime is 185142748111. The reversal of 185142747991 is 199747241581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 185142747991 - 2¹¹ = 185142745943 is a prime.

It is a super-4 number, since 4×185142747991⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185142747191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92571373995 + 92571373996.

It is an arithmetic number, because the mean of its divisors is an integer number (92571373996).

Almost surely, 2^185142747991 is an apocalyptic number.

185142747991 is a deficient number, since it is larger than the sum of its proper divisors (1).

185142747991 is an equidigital number, since it uses as much as digits as its factorization.

185142747991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 58.

The spelling of 185142747991 in words is "one hundred eighty-five billion, one hundred forty-two million, seven hundred forty-seven thousand, nine hundred ninety-one".