661171474 has 4 divisors (see below), whose sum is σ = 991757214. Its totient is φ = 330585736.

The previous prime is 661171457. The next prime is 661171499. The reversal of 661171474 is 474171166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 655616025 + 5555449 = 25605^2 + 2357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165292867 + ... + 165292870.

Almost surely, 2^661171474 is an apocalyptic number.

661171474 is a deficient number, since it is larger than the sum of its proper divisors (330585740).

661171474 is a wasteful number, since it uses less digits than its factorization.

661171474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330585739.

The product of its digits is 28224, while the sum is 37.

The square root of 661171474 is about 25713.2548309233. The cubic root of 661171474 is about 871.1735929789.

The spelling of 661171474 in words is "six hundred sixty-one million, one hundred seventy-one thousand, four hundred seventy-four".