645454497 has 16 divisors (see below), whose sum is σ = 898611840. Its totient is φ = 411324672.

The previous prime is 645454477. The next prime is 645454501. The reversal of 645454497 is 794454546.

It is a happy number.

645454497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645454497 - 2²⁰ = 644405921 is a prime.

It is a super-2 number, since 2×645454497² = 833223015395046018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645454417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198279 + ... + 201507.

It is an arithmetic number, because the mean of its divisors is an integer number (56163240).

Almost surely, 2^645454497 is an apocalyptic number.

It is an amenable number.

645454497 is a deficient number, since it is larger than the sum of its proper divisors (253157343).

645454497 is a wasteful number, since it uses less digits than its factorization.

645454497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6152.

The product of its digits is 2419200, while the sum is 48.

The square root of 645454497 is about 25405.7965236282. The cubic root of 645454497 is about 864.2151531975.

The spelling of 645454497 in words is "six hundred forty-five million, four hundred fifty-four thousand, four hundred ninety-seven".