1285661238485 has 8 divisors (see below), whose sum is σ = 1661469908280. Its totient is φ = 949411376064.

The previous prime is 1285661238479. The next prime is 1285661238497. The reversal of 1285661238485 is 5848321665821.

It can be written as a sum of positive squares in 4 ways, for example, as 103463868964 + 1182197369521 = 321658^2 + 1087289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1285661238485 - 2⁴ = 1285661238469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9889701770 + ... + 9889701899.

It is an arithmetic number, because the mean of its divisors is an integer number (207683738535).

Almost surely, 2^{1285661238485} is an apocalyptic number.

It is an amenable number.

1285661238485 is a deficient number, since it is larger than the sum of its proper divisors (375808669795).

1285661238485 is a wasteful number, since it uses less digits than its factorization.

1285661238485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19779403687.

The product of its digits is 22118400, while the sum is 59.

The spelling of 1285661238485 in words is "one trillion, two hundred eighty-five billion, six hundred sixty-one million, two hundred thirty-eight thousand, four hundred eighty-five".