65616661 has 8 divisors (see below), whose sum is σ = 71678304. Its totient is φ = 59571120.

The previous prime is 65616643. The next prime is 65616679. The reversal of 65616661 is 16661656.

It is an interprime number because it is at equal distance from previous prime (65616643) and next prime (65616679).

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 65616661 - 2⁹ = 65616149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65616661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65616601) 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, 5491 + ... + 12703.

It is an arithmetic number, because the mean of its divisors is an integer number (8959788).

Almost surely, 2^65616661 is an apocalyptic number.

It is an amenable number.

65616661 is a deficient number, since it is larger than the sum of its proper divisors (6061643).

65616661 is a wasteful number, since it uses less digits than its factorization.

65616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8051.

The product of its digits is 38880, while the sum is 37.

The square root of 65616661 is about 8100.4111624040. The cubic root of 65616661 is about 403.3400758536.

The spelling of 65616661 in words is "sixty-five million, six hundred sixteen thousand, six hundred sixty-one".