1681776697 has 8 divisors (see below), whose sum is σ = 1874426400. Its totient is φ = 1499540544.

The previous prime is 1681776667. The next prime is 1681776737. The reversal of 1681776697 is 7966771861.

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 1681776697 - 2¹⁵ = 1681743929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681776647) 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, 2603047 + ... + 2603692.

It is an arithmetic number, because the mean of its divisors is an integer number (234303300).

Almost surely, 2^1681776697 is an apocalyptic number.

1681776697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1681776697 is a deficient number, since it is larger than the sum of its proper divisors (192649703).

1681776697 is a wasteful number, since it uses less digits than its factorization.

1681776697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5206775.

The product of its digits is 5334336, while the sum is 58.

The square root of 1681776697 is about 41009.4708207750. The cubic root of 1681776697 is about 1189.2033122864.

The spelling of 1681776697 in words is "one billion, six hundred eighty-one million, seven hundred seventy-six thousand, six hundred ninety-seven".