1768660681 has 8 divisors (see below), whose sum is σ = 1785062664. Its totient is φ = 1752334080.

The previous prime is 1768660669. The next prime is 1768660687. The reversal of 1768660681 is 1860668671.

It can be written as a sum of positive squares in 4 ways, for example, as 1569427456 + 199233225 = 39616^2 + 14115^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1768660681 - 2¹³ = 1768652489 is a prime.

It is a super-2 number, since 2×1768660681² = 6256321209030767522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1768660687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28851 + ... + 66103.

It is an arithmetic number, because the mean of its divisors is an integer number (223132833).

Almost surely, 2^1768660681 is an apocalyptic number.

It is an amenable number.

1768660681 is a deficient number, since it is larger than the sum of its proper divisors (16401983).

1768660681 is a wasteful number, since it uses less digits than its factorization.

1768660681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37691.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 1768660681 is about 42055.4476970582. The cubic root of 1768660681 is about 1209.3393203566.

The spelling of 1768660681 in words is "one billion, seven hundred sixty-eight million, six hundred sixty thousand, six hundred eighty-one".