646451345 has 8 divisors (see below), whose sum is σ = 816570240. Its totient is φ = 489942000.

The previous prime is 646451341. The next prime is 646451347. The reversal of 646451345 is 543154646.

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

It is not a de Polignac number, because 646451345 - 2² = 646451341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646451299 and 646451308.

It is not an unprimeable number, because it can be changed into a prime (646451341) 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, 3402281 + ... + 3402470.

It is an arithmetic number, because the mean of its divisors is an integer number (102071280).

Almost surely, 2^646451345 is an apocalyptic number.

It is an amenable number.

646451345 is a deficient number, since it is larger than the sum of its proper divisors (170118895).

646451345 is a wasteful number, since it uses less digits than its factorization.

646451345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804775.

The product of its digits is 172800, while the sum is 38.

The square root of 646451345 is about 25425.4074696946. The cubic root of 646451345 is about 864.6598259214.

The spelling of 646451345 in words is "six hundred forty-six million, four hundred fifty-one thousand, three hundred forty-five".