681616466 has 8 divisors (see below), whose sum is σ = 1044178560. Its totient is φ = 333556948.

The previous prime is 681616459. The next prime is 681616471. The reversal of 681616466 is 664616186.

It is a happy number.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3625526 + ... + 3625713.

It is an arithmetic number, because the mean of its divisors is an integer number (130522320).

Almost surely, 2^681616466 is an apocalyptic number.

681616466 is a deficient number, since it is larger than the sum of its proper divisors (362562094).

681616466 is a wasteful number, since it uses less digits than its factorization.

681616466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251288.

The product of its digits is 248832, while the sum is 44.

The square root of 681616466 is about 26107.7855437798. The cubic root of 681616466 is about 880.0621796628.

The spelling of 681616466 in words is "six hundred eighty-one million, six hundred sixteen thousand, four hundred sixty-six".