645606550144 has 32 divisors (see below), whose sum is σ = 1286247698100. Its totient is φ = 322783598592.

The previous prime is 645606550007. The next prime is 645606550229. The reversal of 645606550144 is 441055606546.

It can be written as a sum of positive squares in 2 ways, for example, as 635030484544 + 10576065600 = 796888^2 + 102840^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 645606550094 and 645606550103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2080764 + ... + 2370820.

Almost surely, 2^645606550144 is an apocalyptic number.

645606550144 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645606550144 is a deficient number, since it is larger than the sum of its proper divisors (640641147956).

645606550144 is a wasteful number, since it uses less digits than its factorization.

645606550144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307460 (or 307448 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 645606550144 in words is "six hundred forty-five billion, six hundred six million, five hundred fifty thousand, one hundred forty-four".