61664065 has 8 divisors (see below), whose sum is σ = 74154240. Its totient is φ = 49226352.

The previous prime is 61664059. The next prime is 61664093. The reversal of 61664065 is 56046616.

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 61664065 - 2⁵ = 61664033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61664065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10479 + ... + 15268.

It is an arithmetic number, because the mean of its divisors is an integer number (9269280).

Almost surely, 2^61664065 is an apocalyptic number.

It is an amenable number.

61664065 is a deficient number, since it is larger than the sum of its proper divisors (12490175).

61664065 is a wasteful number, since it uses less digits than its factorization.

61664065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26231.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 61664065 is about 7852.6470059465. The cubic root of 61664065 is about 395.0730303466.

The spelling of 61664065 in words is "sixty-one million, six hundred sixty-four thousand, sixty-five".