61665456 has 40 divisors (see below), whose sum is σ = 160726320. Its totient is φ = 20371456.

The previous prime is 61665437. The next prime is 61665473. The reversal of 61665456 is 65456616.

61665456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 11108.

It is an arithmetic number, because the mean of its divisors is an integer number (4018158).

Almost surely, 2^61665456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61665456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80363160).

61665456 is an abundant number, since it is smaller than the sum of its proper divisors (99060864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61665456 is a wasteful number, since it uses less digits than its factorization.

61665456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11493 (or 11487 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

The square root of 61665456 is about 7852.7355743078. The cubic root of 61665456 is about 395.0760009717.

The spelling of 61665456 in words is "sixty-one million, six hundred sixty-five thousand, four hundred fifty-six".