65720055 has 16 divisors (see below), whose sum is σ = 105472224. Its totient is φ = 34944000.

The previous prime is 65720027. The next prime is 65720059. The reversal of 65720055 is 55002756.

It is not a de Polignac number, because 65720055 - 2⁶ = 65719991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65720059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446 + ... + 11555.

It is an arithmetic number, because the mean of its divisors is an integer number (6592014).

Almost surely, 2^65720055 is an apocalyptic number.

65720055 is a deficient number, since it is larger than the sum of its proper divisors (39752169).

65720055 is a wasteful number, since it uses less digits than its factorization.

65720055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 65720055 is about 8106.7906720231. The cubic root of 65720055 is about 403.5518160740.

The spelling of 65720055 in words is "sixty-five million, seven hundred twenty thousand, fifty-five".