1680137569 has 4 divisors (see below), whose sum is σ = 1832877360. Its totient is φ = 1527397780.

The previous prime is 1680137531. The next prime is 1680137573. The reversal of 1680137569 is 9657310861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1680137569 - 2¹¹ = 1680135521 is a prime.

It is a super-2 number, since 2×1680137569² = 5645724501530459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680137509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76369879 + ... + 76369900.

It is an arithmetic number, because the mean of its divisors is an integer number (458219340).

Almost surely, 2^1680137569 is an apocalyptic number.

It is an amenable number.

1680137569 is a deficient number, since it is larger than the sum of its proper divisors (152739791).

1680137569 is a wasteful number, since it uses less digits than its factorization.

1680137569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152739790.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1680137569 is about 40989.4811994492. The cubic root of 1680137569 is about 1188.8168380558.

The spelling of 1680137569 in words is "one billion, six hundred eighty million, one hundred thirty-seven thousand, five hundred sixty-nine".