1685521644474 has 8 divisors (see below), whose sum is σ = 3371043288960. Its totient is φ = 561840548156.

The previous prime is 1685521644407. The next prime is 1685521644491. The reversal of 1685521644474 is 4744461255861.

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

1685521644474 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140460137034 + ... + 140460137045.

It is an arithmetic number, because the mean of its divisors is an integer number (421380411120).

Almost surely, 2^{1685521644474} is an apocalyptic number.

1685521644474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685521644474 is a wasteful number, since it uses less digits than its factorization.

1685521644474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280920274084.

The product of its digits is 25804800, while the sum is 57.

The spelling of 1685521644474 in words is "one trillion, six hundred eighty-five billion, five hundred twenty-one million, six hundred forty-four thousand, four hundred seventy-four".