61665756 has 24 divisors (see below), whose sum is σ = 144232704. Its totient is φ = 20505840.

The previous prime is 61665743. The next prime is 61665757. The reversal of 61665756 is 65756616.

61665756 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

61665756 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665757) 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, 790 + ... + 11133.

It is an arithmetic number, because the mean of its divisors is an integer number (6009696).

Almost surely, 2^61665756 is an apocalyptic number.

It is an amenable number.

61665756 is an abundant number, since it is smaller than the sum of its proper divisors (82566948).

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

61665756 is a wasteful number, since it uses less digits than its factorization.

61665756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12361 (or 12359 counting only the distinct ones).

The product of its digits is 226800, while the sum is 42.

The square root of 61665756 is about 7852.7546759083. The cubic root of 61665756 is about 395.0766416470.

The spelling of 61665756 in words is "sixty-one million, six hundred sixty-five thousand, seven hundred fifty-six".