645907154 has 16 divisors (see below), whose sum is σ = 974511000. Its totient is φ = 321076224.

The previous prime is 645907151. The next prime is 645907177. The reversal of 645907154 is 451709546.

It can be written as a sum of positive squares in 4 ways, for example, as 250493929 + 395413225 = 15827^2 + 19885^2 .

It is not an unprimeable number, because it can be changed into a prime (645907151) 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 in 7 ways as a sum of consecutive naturals, for example, 283532 + ... + 285800.

Almost surely, 2^645907154 is an apocalyptic number.

645907154 is a deficient number, since it is larger than the sum of its proper divisors (328603846).

645907154 is a wasteful number, since it uses less digits than its factorization.

645907154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 645907154 is about 25414.7035001394. The cubic root of 645907154 is about 864.4171305784.

The spelling of 645907154 in words is "six hundred forty-five million, nine hundred seven thousand, one hundred fifty-four".