285723389961 has 81 divisors (see below), whose sum is σ = 449960988711. Its totient is φ = 174676178304.

The previous prime is 285723389899. The next prime is 285723389999. The reversal of 285723389961 is 169983327582.

The square root of 285723389961 is 534531.

It is a perfect power (a square), and thus also a powerful number.

285723389961 is a `hidden beast` number, since 28 + 572 + 3 + 38 + 9 + 9 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 222449006025 + 63274383936 = 471645^2 + 251544^2 .

It is not a de Polignac number, because 285723389961 - 2¹¹ = 285723387913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (285743389961) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1281270696 + ... + 1281270918.

Almost surely, 2^285723389961 is an apocalyptic number.

285723389961 is the 534531-st square number.

285723389961 is the 267266-th centered octagonal number.

It is an amenable number.

285723389961 is a deficient number, since it is larger than the sum of its proper divisors (164237598750).

285723389961 is an equidigital number, since it uses as much as digits as its factorization.

285723389961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 290 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

It can be divided in two parts, 285723 and 389961, that added together give a square (675684 = 822²).

The spelling of 285723389961 in words is "two hundred eighty-five billion, seven hundred twenty-three million, three hundred eighty-nine thousand, nine hundred sixty-one".