1631996345856 has 320 divisors, whose sum is σ = 4639188787200. Its totient is φ = 508909879296.

The previous prime is 1631996345831. The next prime is 1631996345879. The reversal of 1631996345856 is 6585436991361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243251430 + ... + 243258138.

It is an arithmetic number, because the mean of its divisors is an integer number (14497464960).

Almost surely, 2^{1631996345856} is an apocalyptic number.

1631996345856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631996345856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2319594393600).

1631996345856 is an abundant number, since it is smaller than the sum of its proper divisors (3007192441344).

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

1631996345856 is a wasteful number, since it uses less digits than its factorization.

1631996345856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929 (or 6913 counting only the distinct ones).

The product of its digits is 125971200, while the sum is 66.

The spelling of 1631996345856 in words is "one trillion, six hundred thirty-one billion, nine hundred ninety-six million, three hundred forty-five thousand, eight hundred fifty-six".