645262546 has 4 divisors (see below), whose sum is σ = 967893822. Its totient is φ = 322631272.

The previous prime is 645262543. The next prime is 645262559.

645262546 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 587335225 + 57927321 = 24235^2 + 7611^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645262499 and 645262508.

It is not an unprimeable number, because it can be changed into a prime (645262543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161315635 + ... + 161315638.

Almost surely, 2^645262546 is an apocalyptic number.

645262546 is a deficient number, since it is larger than the sum of its proper divisors (322631276).

645262546 is a wasteful number, since it uses less digits than its factorization.

645262546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322631275.

The product of its digits is 345600, while the sum is 40.

The square root of 645262546 is about 25402.0185418403. The cubic root of 645262546 is about 864.1294753738.

The spelling of 645262546 in words is "six hundred forty-five million, two hundred sixty-two thousand, five hundred forty-six".