645016753 has 8 divisors (see below), whose sum is σ = 676658880. Its totient is φ = 614001360.

The previous prime is 645016747. The next prime is 645016789. The reversal of 645016753 is 357610546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645016753 is a prime.

It is a super-2 number, since 2×645016753² = 832093223301326018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645016793) 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, 154575 + ... + 158692.

It is an arithmetic number, because the mean of its divisors is an integer number (84582360).

Almost surely, 2^645016753 is an apocalyptic number.

It is an amenable number.

645016753 is a deficient number, since it is larger than the sum of its proper divisors (31642127).

645016753 is a wasteful number, since it uses less digits than its factorization.

645016753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313367.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 645016753 is about 25397.1800206243. The cubic root of 645016753 is about 864.0197402219.

The spelling of 645016753 in words is "six hundred forty-five million, sixteen thousand, seven hundred fifty-three".