645477505 has 32 divisors (see below), whose sum is σ = 875888640. Its totient is φ = 454056960.

The previous prime is 645477487. The next prime is 645477509. The reversal of 645477505 is 505774546.

It is not a de Polignac number, because 645477505 - 2¹⁷ = 645346433 is a prime.

It is a super-2 number, since 2×645477505² = 833282418922050050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645477509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72192 + ... + 80638.

It is an arithmetic number, because the mean of its divisors is an integer number (27371520).

Almost surely, 2^645477505 is an apocalyptic number.

It is an amenable number.

645477505 is a deficient number, since it is larger than the sum of its proper divisors (230411135).

645477505 is a wasteful number, since it uses less digits than its factorization.

645477505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8529.

The product of its (nonzero) digits is 588000, while the sum is 43.

The square root of 645477505 is about 25406.2493296433. The cubic root of 645477505 is about 864.2254217375.

The spelling of 645477505 in words is "six hundred forty-five million, four hundred seventy-seven thousand, five hundred five".