645146705 has 8 divisors (see below), whose sum is σ = 884772672. Its totient is φ = 442386288.

The previous prime is 645146699. The next prime is 645146707. The reversal of 645146705 is 507641546.

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

It is a cyclic number.

It is not a de Polignac number, because 645146705 - 2¹² = 645142609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645146707) 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, 9216347 + ... + 9216416.

It is an arithmetic number, because the mean of its divisors is an integer number (110596584).

Almost surely, 2^645146705 is an apocalyptic number.

It is an amenable number.

645146705 is a deficient number, since it is larger than the sum of its proper divisors (239625967).

645146705 is a wasteful number, since it uses less digits than its factorization.

645146705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18432775.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 645146705 is about 25399.7382860533. The cubic root of 645146705 is about 864.0777612232.

The spelling of 645146705 in words is "six hundred forty-five million, one hundred forty-six thousand, seven hundred five".