661164285 has 32 divisors (see below), whose sum is σ = 1101404160. Its totient is φ = 338370048.

The previous prime is 661164271. The next prime is 661164331. The reversal of 661164285 is 582461166.

It is a happy number.

It is not a de Polignac number, because 661164285 - 2⁴ = 661164269 is a prime.

It is a super-2 number, since 2×661164285² = 874276423519122450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32356 + ... + 48674.

It is an arithmetic number, because the mean of its divisors is an integer number (34418880).

Almost surely, 2^661164285 is an apocalyptic number.

It is an amenable number.

661164285 is a deficient number, since it is larger than the sum of its proper divisors (440239875).

661164285 is a wasteful number, since it uses less digits than its factorization.

661164285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16437.

The product of its digits is 69120, while the sum is 39.

The square root of 661164285 is about 25713.1150388279. The cubic root of 661164285 is about 871.1704355077.

The spelling of 661164285 in words is "six hundred sixty-one million, one hundred sixty-four thousand, two hundred eighty-five".