1685716481 has 12 divisors (see below), whose sum is σ = 1848483840. Its totient is φ = 1535369280.

The previous prime is 1685716477. The next prime is 1685716493. The reversal of 1685716481 is 1846175861.

It is a happy number.

It is not a de Polignac number, because 1685716481 - 2² = 1685716477 is a prime.

It is a super-2 number, since 2×1685716481² = 5683280108630046722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1685716381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85121 + ... + 103038.

It is an arithmetic number, because the mean of its divisors is an integer number (154040320).

Almost surely, 2^1685716481 is an apocalyptic number.

It is an amenable number.

1685716481 is a deficient number, since it is larger than the sum of its proper divisors (162767359).

1685716481 is a wasteful number, since it uses less digits than its factorization.

1685716481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188224 (or 188207 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The square root of 1685716481 is about 41057.4777720210. The cubic root of 1685716481 is about 1190.1312100220.

The spelling of 1685716481 in words is "one billion, six hundred eighty-five million, seven hundred sixteen thousand, four hundred eighty-one".