1285661238479 has 2 divisors, whose sum is σ = 1285661238480. Its totient is φ = 1285661238478.

The previous prime is 1285661238469. The next prime is 1285661238497. The reversal of 1285661238479 is 9748321665821.

Together with next prime (1285661238497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285661238479 - 2³⁶ = 1216941761743 is a prime.

It is a super-2 number, since 2×1285661238479² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285661238409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642830619239 + 642830619240.

It is an arithmetic number, because the mean of its divisors is an integer number (642830619240).

Almost surely, 2^{1285661238479} is an apocalyptic number.

1285661238479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285661238479 is an equidigital number, since it uses as much as digits as its factorization.

1285661238479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 62.

The spelling of 1285661238479 in words is "one trillion, two hundred eighty-five billion, six hundred sixty-one million, two hundred thirty-eight thousand, four hundred seventy-nine".