1695637681 has 16 divisors (see below), whose sum is σ = 1819849680. Its totient is φ = 1574277120.

The previous prime is 1695637663. The next prime is 1695637733. The reversal of 1695637681 is 1867365961.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3549456 + 1692088225 = 1884^2 + 41135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1695637681 - 2⁹ = 1695637169 is a prime.

It is a super-2 number, since 2×1695637681² = 5750374290454115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1695637631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444675 + ... + 448471.

It is an arithmetic number, because the mean of its divisors is an integer number (113740605).

Almost surely, 2^1695637681 is an apocalyptic number.

It is an amenable number.

1695637681 is a deficient number, since it is larger than the sum of its proper divisors (124211999).

1695637681 is a wasteful number, since it uses less digits than its factorization.

1695637681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164.

The product of its digits is 1632960, while the sum is 52.

The square root of 1695637681 is about 41178.1213874553. The cubic root of 1695637681 is about 1192.4614636815.

The spelling of 1695637681 in words is "one billion, six hundred ninety-five million, six hundred thirty-seven thousand, six hundred eighty-one".