1656443210640 has 160 divisors (see below), whose sum is σ = 5437622969856. Its totient is φ = 415689523200.

The previous prime is 1656443210593. The next prime is 1656443210693. The reversal of 1656443210640 is 460123446561.

It is a super-2 number, since 2×1656443210640² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1656443210592 and 1656443210601.

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 31 ways as a sum of consecutive naturals, for example, 53159065 + ... + 53190215.

Almost surely, 2^{1656443210640} is an apocalyptic number.

1656443210640 is a gapful number since it is divisible by the number (10) 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 1656443210640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2718811484928).

1656443210640 is an abundant number, since it is smaller than the sum of its proper divisors (3781179759216).

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

1656443210640 is a wasteful number, since it uses less digits than its factorization.

1656443210640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44217 (or 44211 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 1656443210640 in words is "one trillion, six hundred fifty-six billion, four hundred forty-three million, two hundred ten thousand, six hundred forty".