661074416 has 40 divisors (see below), whose sum is σ = 1301583360. Its totient is φ = 325215936.

The previous prime is 661074413. The next prime is 661074443. The reversal of 661074416 is 614470166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661074413) 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, 374945 + ... + 376703.

It is an arithmetic number, because the mean of its divisors is an integer number (32539584).

Almost surely, 2^661074416 is an apocalyptic number.

It is an amenable number.

661074416 is a deficient number, since it is larger than the sum of its proper divisors (640508944).

661074416 is a wasteful number, since it uses less digits than its factorization.

661074416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 661074416 is about 25711.3674471040. The cubic root of 661074416 is about 871.1309623313.

The spelling of 661074416 in words is "six hundred sixty-one million, seventy-four thousand, four hundred sixteen".