645734353 has 4 divisors (see below), whose sum is σ = 704437488. Its totient is φ = 587031220.

The previous prime is 645734339. The next prime is 645734357. The reversal of 645734353 is 353437546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 645734353 - 2⁵ = 645734321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645734357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29351551 + ... + 29351572.

It is an arithmetic number, because the mean of its divisors is an integer number (176109372).

Almost surely, 2^645734353 is an apocalyptic number.

It is an amenable number.

645734353 is a deficient number, since it is larger than the sum of its proper divisors (58703135).

645734353 is a wasteful number, since it uses less digits than its factorization.

645734353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58703134.

The product of its digits is 453600, while the sum is 40.

The square root of 645734353 is about 25411.3036462123. The cubic root of 645734353 is about 864.3400372138.

The spelling of 645734353 in words is "six hundred forty-five million, seven hundred thirty-four thousand, three hundred fifty-three".