661118474 has 8 divisors (see below), whose sum is σ = 1050011748. Its totient is φ = 311114560.

The previous prime is 661118473. The next prime is 661118483. The reversal of 661118474 is 474811166.

It can be written as a sum of positive squares in 2 ways, for example, as 648466225 + 12652249 = 25465^2 + 3557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (661118473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9722297 + ... + 9722364.

Almost surely, 2^661118474 is an apocalyptic number.

661118474 is a deficient number, since it is larger than the sum of its proper divisors (388893274).

661118474 is a wasteful number, since it uses less digits than its factorization.

661118474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19444680.

The product of its digits is 32256, while the sum is 38.

The square root of 661118474 is about 25712.2242133970. The cubic root of 661118474 is about 871.1503143812.

The spelling of 661118474 in words is "six hundred sixty-one million, one hundred eighteen thousand, four hundred seventy-four".