1681925716 has 6 divisors (see below), whose sum is σ = 2943370010. Its totient is φ = 840962856.

The previous prime is 1681925711. The next prime is 1681925717. The reversal of 1681925716 is 6175291861.

It can be written as a sum of positive squares in only one way, i.e., 1611701316 + 70224400 = 40146^2 + 8380^2 .

It is a super-2 number, since 2×1681925716² = 5657748228284225312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681925711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210240711 + ... + 210240718.

Almost surely, 2^1681925716 is an apocalyptic number.

It is an amenable number.

1681925716 is a deficient number, since it is larger than the sum of its proper divisors (1261444294).

1681925716 is a wasteful number, since it uses less digits than its factorization.

1681925716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420481433 (or 420481431 counting only the distinct ones).

The product of its digits is 181440, while the sum is 46.

The square root of 1681925716 is about 41011.2876657147. The cubic root of 1681925716 is about 1189.2384355888.

The spelling of 1681925716 in words is "one billion, six hundred eighty-one million, nine hundred twenty-five thousand, seven hundred sixteen".