65553691 has 8 divisors (see below), whose sum is σ = 75275264. Its totient is φ = 55921320.

The previous prime is 65553689. The next prime is 65553701. The reversal of 65553691 is 19635556.

65553691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 65553691 - 2¹ = 65553689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65553641) by changing a digit.

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, 20715 + ... + 23668.

It is an arithmetic number, because the mean of its divisors is an integer number (9409408).

Almost surely, 2^65553691 is an apocalyptic number.

65553691 is a deficient number, since it is larger than the sum of its proper divisors (9721573).

65553691 is a wasteful number, since it uses less digits than its factorization.

65553691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44601.

The product of its digits is 121500, while the sum is 40.

The square root of 65553691 is about 8096.5233897025. The cubic root of 65553691 is about 403.2110108003.

The spelling of 65553691 in words is "sixty-five million, five hundred fifty-three thousand, six hundred ninety-one".