661203450 has 36 divisors (see below), whose sum is σ = 1776434478. Its totient is φ = 176320800.

The previous prime is 661203449. The next prime is 661203479. The reversal of 661203450 is 54302166.

661203450 is a `hidden beast` number, since 6 + 6 + 1 + 203 + 450 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 523540161 + 137663289 = 22881^2 + 11733^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 734221 + ... + 735120.

Almost surely, 2^661203450 is an apocalyptic number.

661203450 is an abundant number, since it is smaller than the sum of its proper divisors (1115231028).

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

661203450 is a wasteful number, since it uses less digits than its factorization.

661203450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469359 (or 1469351 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 661203450 is about 25713.8766038884. The cubic root of 661203450 is about 871.1876368383.

The spelling of 661203450 in words is "six hundred sixty-one million, two hundred three thousand, four hundred fifty".