61006665 has 16 divisors (see below), whose sum is σ = 97891200. Its totient is φ = 32443392.

The previous prime is 61006661. The next prime is 61006681. The reversal of 61006665 is 56660016.

61006665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61006665 - 2² = 61006661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61006661) 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 15 ways as a sum of consecutive naturals, for example, 280 + ... + 11049.

It is an arithmetic number, because the mean of its divisors is an integer number (6118200).

Almost surely, 2^61006665 is an apocalyptic number.

It is an amenable number.

61006665 is a deficient number, since it is larger than the sum of its proper divisors (36884535).

61006665 is a wasteful number, since it uses less digits than its factorization.

61006665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11696.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 61006665 is about 7810.6763471546. The cubic root of 61006665 is about 393.6640548120.

The spelling of 61006665 in words is "sixty-one million, six thousand, six hundred sixty-five".