65641655 has 16 divisors (see below), whose sum is σ = 82551744. Its totient is φ = 50012160.

The previous prime is 65641651. The next prime is 65641661. The reversal of 65641655 is 55614656.

It is not a de Polignac number, because 65641655 - 2² = 65641651 is a prime.

It is a super-2 number, since 2×65641655² = 8617653742278050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65641651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28445 + ... + 30665.

It is an arithmetic number, because the mean of its divisors is an integer number (5159484).

Almost surely, 2^65641655 is an apocalyptic number.

65641655 is a deficient number, since it is larger than the sum of its proper divisors (16910089).

65641655 is a wasteful number, since it uses less digits than its factorization.

65641655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506.

The product of its digits is 108000, while the sum is 38.

The square root of 65641655 is about 8101.9537767134. The cubic root of 65641655 is about 403.3912813552.

The spelling of 65641655 in words is "sixty-five million, six hundred forty-one thousand, six hundred fifty-five".