645541450 has 48 divisors (see below), whose sum is σ = 1246661280. Its totient is φ = 248400320.

The previous prime is 645541447. The next prime is 645541513. The reversal of 645541450 is 54145546.

645541450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502509 + ... + 503791.

It is an arithmetic number, because the mean of its divisors is an integer number (25972110).

Almost surely, 2^645541450 is an apocalyptic number.

645541450 is a deficient number, since it is larger than the sum of its proper divisors (601119830).

645541450 is a wasteful number, since it uses less digits than its factorization.

645541450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671 (or 1666 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 645541450 is about 25407.5077486951. The cubic root of 645541450 is about 864.2539593031.

Adding to 645541450 its reverse (54145546), we get a palindrome (699686996).

The spelling of 645541450 in words is "six hundred forty-five million, five hundred forty-one thousand, four hundred fifty".