1681609722 has 16 divisors (see below), whose sum is σ = 3621928800. Its totient is φ = 517418352.

The previous prime is 1681609691. The next prime is 1681609739. The reversal of 1681609722 is 2279061861.

It is a super-2 number, since 2×1681609722² = 5655622514249834568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10779472 + ... + 10779627.

It is an arithmetic number, because the mean of its divisors is an integer number (226370550).

Almost surely, 2^1681609722 is an apocalyptic number.

1681609722 is an abundant number, since it is smaller than the sum of its proper divisors (1940319078).

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

1681609722 is a wasteful number, since it uses less digits than its factorization.

1681609722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21559117.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1681609722 is about 41007.4349600167. The cubic root of 1681609722 is about 1189.1639543472.

The spelling of 1681609722 in words is "one billion, six hundred eighty-one million, six hundred nine thousand, seven hundred twenty-two".