645106600554 has 32 divisors (see below), whose sum is σ = 1389550498560. Its totient is φ = 198481463232.

The previous prime is 645106600549. The next prime is 645106600603. The reversal of 645106600554 is 455006601546.

It is a super-2 number, since 2×645106600554² (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 15 ways as a sum of consecutive naturals, for example, 978892 + ... + 1499480.

It is an arithmetic number, because the mean of its divisors is an integer number (43423453080).

Almost surely, 2^645106600554 is an apocalyptic number.

645106600554 is an abundant number, since it is smaller than the sum of its proper divisors (744443898006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645106600554 is a wasteful number, since it uses less digits than its factorization.

645106600554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536494.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 645106600554 in words is "six hundred forty-five billion, one hundred six million, six hundred thousand, five hundred fifty-four".