1347391635985 has 16 divisors (see below), whose sum is σ = 1644070493520. Its totient is φ = 1059913451520.

The previous prime is 1347391635923. The next prime is 1347391636009. The reversal of 1347391635985 is 5895361937431.

It is a Cunningham number, because it is equal to 1160772²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 862329532689 + 485062103296 = 928617^2 + 696464^2 .

It is not a de Polignac number, because 1347391635985 - 2¹³ = 1347391627793 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8283672 + ... + 8444761.

It is an arithmetic number, because the mean of its divisors is an integer number (102754405845).

Almost surely, 2^{1347391635985} is an apocalyptic number.

It is an amenable number.

1347391635985 is a deficient number, since it is larger than the sum of its proper divisors (296678857535).

1347391635985 is a wasteful number, since it uses less digits than its factorization.

1347391635985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16728708.

The product of its digits is 73483200, while the sum is 64.

The spelling of 1347391635985 in words is "one trillion, three hundred forty-seven billion, three hundred ninety-one million, six hundred thirty-five thousand, nine hundred eighty-five".