661485 has 32 divisors (see below), whose sum is σ = 1221120. Its totient is φ = 302400.

The previous prime is 661483. The next prime is 661513. The reversal of 661485 is 584166.

It is not a de Polignac number, because 661485 - 2¹ = 661483 is a prime.

661485 is a lucky number.

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 31 ways as a sum of consecutive naturals, for example, 3030 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (38160).

2⁶⁶¹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

661485 is a deficient number, since it is larger than the sum of its proper divisors (559635).

661485 is a wasteful number, since it uses less digits than its factorization.

661485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 5760, while the sum is 30.

The square root of 661485 is about 813.3172812624. The cubic root of 661485 is about 87.1311274060.

It can be divided in two parts, 66 and 1485, that added together give a palindrome (1551).

The spelling of 661485 in words is "six hundred sixty-one thousand, four hundred eighty-five".