1680918002 has 16 divisors (see below), whose sum is σ = 2604153240. Its totient is φ = 813301632.

The previous prime is 1680917983. The next prime is 1680918007. The reversal of 1680918002 is 2008190861.

It is a Cunningham number, because it is equal to 40999²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1211805721 + 469112281 = 34811^2 + 21659^2 .

It is not an unprimeable number, because it can be changed into a prime (1680918007) 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, 100877 + ... + 116352.

Almost surely, 2^1680918002 is an apocalyptic number.

1680918002 is a deficient number, since it is larger than the sum of its proper divisors (923235238).

1680918002 is a wasteful number, since it uses less digits than its factorization.

1680918002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217357.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1680918002 is about 40999.0000121954. Note that the first 4 decimals coincide. The cubic root of 1680918002 is about 1189.0008801824. Note that the first 3 decimals are identical.

The spelling of 1680918002 in words is "one billion, six hundred eighty million, nine hundred eighteen thousand, two".