645454546 has 16 divisors (see below), whose sum is σ = 1056602880. Its totient is φ = 293276080.

The previous prime is 645454519. The next prime is 645454549.

645454546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645454546² = 833223141904132232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645454549) 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, 87240 + ... + 94348.

It is an arithmetic number, because the mean of its divisors is an integer number (66037680).

Almost surely, 2^645454546 is an apocalyptic number.

645454546 is a deficient number, since it is larger than the sum of its proper divisors (411148334).

645454546 is a wasteful number, since it uses less digits than its factorization.

645454546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11249.

The product of its digits is 1152000, while the sum is 43.

The square root of 645454546 is about 25405.7974879751. The cubic root of 645454546 is about 864.2151750666.

The spelling of 645454546 in words is "six hundred forty-five million, four hundred fifty-four thousand, five hundred forty-six".