645555254 has 8 divisors (see below), whose sum is σ = 1001723760. Its totient is φ = 311647336.

The previous prime is 645555227. The next prime is 645555257. The reversal of 645555254 is 452555546.

645555254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645555257) 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, 5565074 + ... + 5565189.

It is an arithmetic number, because the mean of its divisors is an integer number (125215470).

Almost surely, 2^645555254 is an apocalyptic number.

645555254 is a deficient number, since it is larger than the sum of its proper divisors (356168506).

645555254 is a wasteful number, since it uses less digits than its factorization.

645555254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130294.

The product of its digits is 600000, while the sum is 41.

The square root of 645555254 is about 25407.7793992313. The cubic root of 645555254 is about 864.2601195461.

The spelling of 645555254 in words is "six hundred forty-five million, five hundred fifty-five thousand, two hundred fifty-four".