285123933661 has 12 divisors (see below), whose sum is σ = 332234130492. Its totient is φ = 243979790208.

The previous prime is 285123933659. The next prime is 285123933671. The reversal of 285123933661 is 166339321582.

It can be written as a sum of positive squares in 2 ways, for example, as 65130102436 + 219993831225 = 255206^2 + 469035^2 .

It is not a de Polignac number, because 285123933661 - 2¹ = 285123933659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285123933671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4877230 + ... + 4935343.

It is an arithmetic number, because the mean of its divisors is an integer number (27686177541).

Almost surely, 2^285123933661 is an apocalyptic number.

It is an amenable number.

285123933661 is a deficient number, since it is larger than the sum of its proper divisors (47110196831).

285123933661 is an equidigital number, since it uses as much as digits as its factorization.

285123933661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9813180 (or 9813173 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 49.

The spelling of 285123933661 in words is "two hundred eighty-five billion, one hundred twenty-three million, nine hundred thirty-three thousand, six hundred sixty-one".