646202253545 has 32 divisors (see below), whose sum is σ = 792080438688. Its totient is φ = 505991743488.

The previous prime is 646202253509. The next prime is 646202253547. The reversal of 646202253545 is 545352202646.

It can be written as a sum of positive squares in 16 ways, for example, as 13125826624 + 633076426921 = 114568^2 + 795661^2 .

It is a cyclic number.

It is not a de Polignac number, because 646202253545 - 2⁶ = 646202253481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646202253496 and 646202253505.

It is not an unprimeable number, because it can be changed into a prime (646202253547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28534967 + ... + 28557603.

It is an arithmetic number, because the mean of its divisors is an integer number (24752513709).

Almost surely, 2^646202253545 is an apocalyptic number.

It is an amenable number.

646202253545 is a deficient number, since it is larger than the sum of its proper divisors (145878185143).

646202253545 is a wasteful number, since it uses less digits than its factorization.

646202253545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23309.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 646202253545 in words is "six hundred forty-six billion, two hundred two million, two hundred fifty-three thousand, five hundred forty-five".