661486 has 16 divisors (see below), whose sum is σ = 1165536. Its totient is φ = 275616.

The previous prime is 661483. The next prime is 661513. The reversal of 661486 is 684166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (72846).

2⁶⁶¹⁴⁸⁶ is an apocalyptic number.

661486 is a deficient number, since it is larger than the sum of its proper divisors (504050).

661486 is a wasteful number, since it uses less digits than its factorization.

661486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323.

The product of its digits is 6912, while the sum is 31.

The square root of 661486 is about 813.3178960284. The cubic root of 661486 is about 87.1311713128.

The spelling of 661486 in words is "six hundred sixty-one thousand, four hundred eighty-six".