661494 has 16 divisors (see below), whose sum is σ = 1355760. Its totient is φ = 215040.

The previous prime is 661483. The next prime is 661513. The reversal of 661494 is 494166.

It is a congruent number.

It is an unprimeable number.

661494 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1099 + ... + 1590.

It is an arithmetic number, because the mean of its divisors is an integer number (84735).

2⁶⁶¹⁴⁹⁴ is an apocalyptic number.

661494 is an abundant number, since it is smaller than the sum of its proper divisors (694266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661494 is a wasteful number, since it uses less digits than its factorization.

661494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735.

The product of its digits is 5184, while the sum is 30.

The square root of 661494 is about 813.3228141396. The cubic root of 661494 is about 87.1315225657.

The spelling of 661494 in words is "six hundred sixty-one thousand, four hundred ninety-four".