661341205 has 8 divisors (see below), whose sum is σ = 906982272. Its totient is φ = 453491088.

The previous prime is 661341127. The next prime is 661341211. The reversal of 661341205 is 502143166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661341205 - 2²⁷ = 527123477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9447697 + ... + 9447766.

It is an arithmetic number, because the mean of its divisors is an integer number (113372784).

Almost surely, 2^661341205 is an apocalyptic number.

It is an amenable number.

661341205 is a deficient number, since it is larger than the sum of its proper divisors (245641067).

661341205 is a wasteful number, since it uses less digits than its factorization.

661341205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18895475.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661341205 is about 25716.5550764483. Note that the first 3 decimals coincide. The cubic root of 661341205 is about 871.2481336590.

The spelling of 661341205 in words is "six hundred sixty-one million, three hundred forty-one thousand, two hundred five".