661083305 has 16 divisors (see below), whose sum is σ = 810989760. Its totient is φ = 517188672.

The previous prime is 661083289. The next prime is 661083307. The reversal of 661083305 is 503380166.

It is a cyclic number.

It is not a de Polignac number, because 661083305 - 2⁴ = 661083289 is a prime.

It is a super-2 number, since 2×661083305² = 874062272299446050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661083307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39467 + ... + 53663.

It is an arithmetic number, because the mean of its divisors is an integer number (50686860).

Almost surely, 2^661083305 is an apocalyptic number.

It is an amenable number.

661083305 is a deficient number, since it is larger than the sum of its proper divisors (149906455).

661083305 is a wasteful number, since it uses less digits than its factorization.

661083305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14408.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 661083305 is about 25711.5403078073. The cubic root of 661083305 is about 871.1348668077.

The spelling of 661083305 in words is "six hundred sixty-one million, eighty-three thousand, three hundred five".