661474 has 16 divisors (see below), whose sum is σ = 1096416. Its totient is φ = 296800.

The previous prime is 661459. The next prime is 661477. The reversal of 661474 is 474166.

661474 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661477) 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, 2214 + ... + 2494.

It is an arithmetic number, because the mean of its divisors is an integer number (68526).

2⁶⁶¹⁴⁷⁴ is an apocalyptic number.

661474 is a deficient number, since it is larger than the sum of its proper divisors (434942).

661474 is a wasteful number, since it uses less digits than its factorization.

661474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 4032, while the sum is 28.

The square root of 661474 is about 813.3105188057. The cubic root of 661474 is about 87.1306444282.

It can be divided in two parts, 66 and 1474, that added together give a triangular number (1540 = T₅₅).

The spelling of 661474 in words is "six hundred sixty-one thousand, four hundred seventy-four".