661074417 has 6 divisors (see below), whose sum is σ = 954885282. Its totient is φ = 440716272.

The previous prime is 661074413. The next prime is 661074443. The reversal of 661074417 is 714470166.

It can be written as a sum of positive squares in only one way, i.e., 649026576 + 12047841 = 25476^2 + 3471^2 .

It is not a de Polignac number, because 661074417 - 2² = 661074413 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661074413) 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 5 ways as a sum of consecutive naturals, for example, 36726348 + ... + 36726365.

It is an arithmetic number, because the mean of its divisors is an integer number (159147547).

Almost surely, 2^661074417 is an apocalyptic number.

It is an amenable number.

661074417 is a deficient number, since it is larger than the sum of its proper divisors (293810865).

661074417 is a wasteful number, since it uses less digits than its factorization.

661074417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73452719 (or 73452716 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 661074417 is about 25711.3674665507. The cubic root of 661074417 is about 871.1309627705.

The spelling of 661074417 in words is "six hundred sixty-one million, seventy-four thousand, four hundred seventeen".