1681660434 has 48 divisors (see below), whose sum is σ = 3660316128. Its totient is φ = 513278208.

The previous prime is 1681660399. The next prime is 1681660499. The reversal of 1681660434 is 4340661861.

It is a junction number, because it is equal to n+sod(n) for n = 1681660392 and 1681660401.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133617 + ... + 145659.

It is an arithmetic number, because the mean of its divisors is an integer number (76256586).

Almost surely, 2^1681660434 is an apocalyptic number.

1681660434 is an abundant number, since it is smaller than the sum of its proper divisors (1978655694).

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

1681660434 is a wasteful number, since it uses less digits than its factorization.

1681660434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12139 (or 12102 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 1681660434 is about 41008.0532822518. The cubic root of 1681660434 is about 1189.1759080277.

The spelling of 1681660434 in words is "one billion, six hundred eighty-one million, six hundred sixty thousand, four hundred thirty-four".