61641065 has 8 divisors (see below), whose sum is σ = 78320520. Its totient is φ = 46412032.

The previous prime is 61641053. The next prime is 61641109. The reversal of 61641065 is 56014616.

61641065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9916201 + 51724864 = 3149^2 + 7192^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61641065 - 2⁸ = 61640809 is a prime.

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, 362510 + ... + 362679.

It is an arithmetic number, because the mean of its divisors is an integer number (9790065).

Almost surely, 2^61641065 is an apocalyptic number.

It is an amenable number.

61641065 is a deficient number, since it is larger than the sum of its proper divisors (16679455).

61641065 is a wasteful number, since it uses less digits than its factorization.

61641065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725211.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 61641065 is about 7851.1823950282. The cubic root of 61641065 is about 395.0239049785.

The spelling of 61641065 in words is "sixty-one million, six hundred forty-one thousand, sixty-five".