645953453 has 8 divisors (see below), whose sum is σ = 680837400. Its totient is φ = 611910208.

The previous prime is 645953449. The next prime is 645953489. The reversal of 645953453 is 354359546.

645953453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 289612324 + 356341129 = 17018^2 + 18877^2 .

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

It is not a de Polignac number, because 645953453 - 2² = 645953449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645953053) 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, 208598 + ... + 211671.

It is an arithmetic number, because the mean of its divisors is an integer number (85104675).

Almost surely, 2^645953453 is an apocalyptic number.

It is an amenable number.

645953453 is a deficient number, since it is larger than the sum of its proper divisors (34883947).

645953453 is a wasteful number, since it uses less digits than its factorization.

645953453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420351.

The product of its digits is 972000, while the sum is 44.

The square root of 645953453 is about 25415.6143541721. The cubic root of 645953453 is about 864.4377840590.

The spelling of 645953453 in words is "six hundred forty-five million, nine hundred fifty-three thousand, four hundred fifty-three".