61665541 has 8 divisors (see below), whose sum is σ = 72748544. Its totient is φ = 51150960.

The previous prime is 61665533. The next prime is 61665557. The reversal of 61665541 is 14556616.

It is a happy number.

61665541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61665541 - 2³ = 61665533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61665497 and 61665506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665841) by changing a digit.

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, 141870 + ... + 142303.

It is an arithmetic number, because the mean of its divisors is an integer number (9093568).

Almost surely, 2^61665541 is an apocalyptic number.

It is an amenable number.

61665541 is a deficient number, since it is larger than the sum of its proper divisors (11083003).

61665541 is a wasteful number, since it uses less digits than its factorization.

61665541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284211.

The product of its digits is 21600, while the sum is 34.

The square root of 61665541 is about 7852.7409864327. The cubic root of 61665541 is about 395.0761824966.

The spelling of 61665541 in words is "sixty-one million, six hundred sixty-five thousand, five hundred forty-one".