1685291901322 has 4 divisors (see below), whose sum is σ = 2527937851986. Its totient is φ = 842645950660.

The previous prime is 1685291901203. The next prime is 1685291901323. The reversal of 1685291901322 is 2231091925861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1684697565681 + 594335641 = 1297959^2 + 24379^2 .

It is not an unprimeable number, because it can be changed into a prime (1685291901323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421322975329 + ... + 421322975332.

Almost surely, 2^{1685291901322} is an apocalyptic number.

1685291901322 is a deficient number, since it is larger than the sum of its proper divisors (842645950664).

1685291901322 is an equidigital number, since it uses as much as digits as its factorization.

1685291901322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842645950663.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 1685291901322 in words is "one trillion, six hundred eighty-five billion, two hundred ninety-one million, nine hundred one thousand, three hundred twenty-two".