645064354610 has 16 divisors (see below), whose sum is σ = 1250432441496. Its totient is φ = 238177607808.

The previous prime is 645064354609. The next prime is 645064354637. The reversal of 645064354610 is 16453460546.

It can be written as a sum of positive squares in 4 ways, for example, as 526406840521 + 118657514089 = 725539^2 + 344467^2 .

It is a super-2 number, since 2×645064354610² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2481016619 + ... + 2481016878.

Almost surely, 2^645064354610 is an apocalyptic number.

645064354610 is a deficient number, since it is larger than the sum of its proper divisors (605368086886).

645064354610 is a wasteful number, since it uses less digits than its factorization.

645064354610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962033517.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 645064354610 in words is "six hundred forty-five billion, sixty-four million, three hundred fifty-four thousand, six hundred ten".