1680021635858 has 8 divisors (see below), whose sum is σ = 2601323823360. Its totient is φ = 812913694740.

The previous prime is 1680021635857. The next prime is 1680021635869. The reversal of 1680021635858 is 8585361200861.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1680021635857) 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, 13548561518 + ... + 13548561641.

It is an arithmetic number, because the mean of its divisors is an integer number (325165477920).

Almost surely, 2^{1680021635858} is an apocalyptic number.

1680021635858 is a deficient number, since it is larger than the sum of its proper divisors (921302187502).

1680021635858 is a wasteful number, since it uses less digits than its factorization.

1680021635858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27097123192.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 1680021635858 in words is "one trillion, six hundred eighty billion, twenty-one million, six hundred thirty-five thousand, eight hundred fifty-eight".