285996178261 has 2 divisors, whose sum is σ = 285996178262. Its totient is φ = 285996178260.

The previous prime is 285996178207. The next prime is 285996178309. The reversal of 285996178261 is 162871699582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234807115761 + 51189062500 = 484569^2 + 226250^2 .

It is a cyclic number.

It is not a de Polignac number, because 285996178261 - 2²³ = 285987789653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 285996178193 and 285996178202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285996178961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142998089130 + 142998089131.

It is an arithmetic number, because the mean of its divisors is an integer number (142998089131).

Almost surely, 2^285996178261 is an apocalyptic number.

It is an amenable number.

285996178261 is a deficient number, since it is larger than the sum of its proper divisors (1).

285996178261 is an equidigital number, since it uses as much as digits as its factorization.

285996178261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 64.

The spelling of 285996178261 in words is "two hundred eighty-five billion, nine hundred ninety-six million, one hundred seventy-eight thousand, two hundred sixty-one".