6645166450 has 48 divisors (see below), whose sum is σ = 13328287560. Its totient is φ = 2450373120.

The previous prime is 6645166309. The next prime is 6645166453. The reversal of 6645166450 is 546615466.

It can be written as a sum of positive squares in 12 ways, for example, as 8946081 + 6636220369 = 2991^2 + 81463^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6645166397 and 6645166406.

It is not an unprimeable number, because it can be changed into a prime (6645166453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 519532 + ... + 532168.

Almost surely, 2^6645166450 is an apocalyptic number.

6645166450 is an abundant number, since it is smaller than the sum of its proper divisors (6683121110).

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

6645166450 is a wasteful number, since it uses less digits than its factorization.

6645166450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13471 (or 13466 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 6645166450 is about 81517.8903676978. The cubic root of 6645166450 is about 1880.0466309922.

The spelling of 6645166450 in words is "six billion, six hundred forty-five million, one hundred sixty-six thousand, four hundred fifty".