1680568537 has 8 divisors (see below), whose sum is σ = 1699074504. Its totient is φ = 1662163968.

The previous prime is 1680568517. The next prime is 1680568583. The reversal of 1680568537 is 7358650861.

It can be written as a sum of positive squares in 4 ways, for example, as 618069321 + 1062499216 = 24861^2 + 32596^2 .

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 1680568537 - 2²⁷ = 1546350809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680568517) 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, 8223 + ... + 58555.

It is an arithmetic number, because the mean of its divisors is an integer number (212384313).

Almost surely, 2^1680568537 is an apocalyptic number.

It is an amenable number.

1680568537 is a deficient number, since it is larger than the sum of its proper divisors (18505967).

1680568537 is a wasteful number, since it uses less digits than its factorization.

1680568537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50699.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The square root of 1680568537 is about 40994.7379184207. The cubic root of 1680568537 is about 1188.9184762042.

The spelling of 1680568537 in words is "one billion, six hundred eighty million, five hundred sixty-eight thousand, five hundred thirty-seven".