645206457 has 16 divisors (see below), whose sum is σ = 1041005952. Its totient is φ = 347001600.

The previous prime is 645206431. The next prime is 645206473. The reversal of 645206457 is 754602546.

645206457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645206457 - 2⁷ = 645206329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645206417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903294 + ... + 904007.

It is an arithmetic number, because the mean of its divisors is an integer number (65062872).

Almost surely, 2^645206457 is an apocalyptic number.

It is an amenable number.

645206457 is a deficient number, since it is larger than the sum of its proper divisors (395799495).

645206457 is a wasteful number, since it uses less digits than its factorization.

645206457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807328.

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 645206457 is about 25400.9144914115. The cubic root of 645206457 is about 864.1044366962.

The spelling of 645206457 in words is "six hundred forty-five million, two hundred six thousand, four hundred fifty-seven".