243148391785 has 16 divisors (see below), whose sum is σ = 315801561600. Its totient is φ = 178653435840.

The previous prime is 243148391777. The next prime is 243148391789. The reversal of 243148391785 is 587193841342.

It is not a de Polignac number, because 243148391785 - 2³ = 243148391777 is a prime.

It is a super-2 number, since 2×243148391785² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243148391789) 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 in 15 ways as a sum of consecutive naturals, for example, 9385921 + ... + 9411790.

It is an arithmetic number, because the mean of its divisors is an integer number (19737597600).

Almost surely, 2^243148391785 is an apocalyptic number.

It is an amenable number.

243148391785 is a deficient number, since it is larger than the sum of its proper divisors (72653169815).

243148391785 is a wasteful number, since it uses less digits than its factorization.

243148391785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18797928.

The product of its digits is 5806080, while the sum is 55.

The spelling of 243148391785 in words is "two hundred forty-three billion, one hundred forty-eight million, three hundred ninety-one thousand, seven hundred eighty-five".