1680330154 has 4 divisors (see below), whose sum is σ = 2520495234. Its totient is φ = 840165076.

The previous prime is 1680330097. The next prime is 1680330161. The reversal of 1680330154 is 4510330861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4510330861 = 263 ⋅17149547.

It can be written as a sum of positive squares in only one way, i.e., 1590175129 + 90155025 = 39877^2 + 9495^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420082537 + ... + 420082540.

Almost surely, 2^1680330154 is an apocalyptic number.

1680330154 is a deficient number, since it is larger than the sum of its proper divisors (840165080).

1680330154 is an equidigital number, since it uses as much as digits as its factorization.

1680330154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840165079.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1680330154 is about 40991.8303323967. The cubic root of 1680330154 is about 1188.8622588491.

The spelling of 1680330154 in words is "one billion, six hundred eighty million, three hundred thirty thousand, one hundred fifty-four".