661203369 has 24 divisors (see below), whose sum is σ = 972011040. Its totient is φ = 433021248.

The previous prime is 661203353. The next prime is 661203373. The reversal of 661203369 is 963302166.

661203369 is a `hidden beast` number, since 6 + 612 + 0 + 3 + 36 + 9 = 666.

661203369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661203369 - 2⁴ = 661203353 is a prime.

It is a super-2 number, since 2×661203369² = 874379790353900322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661203349) 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, 251349 + ... + 253965.

It is an arithmetic number, because the mean of its divisors is an integer number (40500460).

Almost surely, 2^661203369 is an apocalyptic number.

It is an amenable number.

661203369 is a deficient number, since it is larger than the sum of its proper divisors (310807671).

661203369 is a wasteful number, since it uses less digits than its factorization.

661203369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109 (or 3106 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 661203369 is about 25713.8750288633. The cubic root of 661203369 is about 871.1876012637.

The spelling of 661203369 in words is "six hundred sixty-one million, two hundred three thousand, three hundred sixty-nine".