661088285 has 32 divisors (see below), whose sum is σ = 937681920. Its totient is φ = 443726400.

The previous prime is 661088273. The next prime is 661088303. The reversal of 661088285 is 582880166.

It is not a de Polignac number, because 661088285 - 2⁴ = 661088269 is a prime.

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, 118100 + ... + 123570.

It is an arithmetic number, because the mean of its divisors is an integer number (29302560).

Almost surely, 2^661088285 is an apocalyptic number.

661088285 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

661088285 is a deficient number, since it is larger than the sum of its proper divisors (276593635).

661088285 is a wasteful number, since it uses less digits than its factorization.

661088285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526 (or 5500 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 661088285 is about 25711.6371512979. The cubic root of 661088285 is about 871.1370542480.

The spelling of 661088285 in words is "six hundred sixty-one million, eighty-eight thousand, two hundred eighty-five".