65551001 has 4 divisors (see below), whose sum is σ = 65621604. Its totient is φ = 65480400.

The previous prime is 65550977. The next prime is 65551033. The reversal of 65551001 is 10015556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18696976 + 46854025 = 4324^2 + 6845^2 .

It is a cyclic number.

It is not a de Polignac number, because 65551001 - 2⁶ = 65550937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65551061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33890 + ... + 35771.

It is an arithmetic number, because the mean of its divisors is an integer number (16405401).

Almost surely, 2^65551001 is an apocalyptic number.

It is an amenable number.

65551001 is a deficient number, since it is larger than the sum of its proper divisors (70603).

65551001 is an equidigital number, since it uses as much as digits as its factorization.

65551001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70602.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 65551001 is about 8096.3572673147. The cubic root of 65551001 is about 403.2054954615.

Adding to 65551001 its reverse (10015556), we get a palindrome (75566557).

The spelling of 65551001 in words is "sixty-five million, five hundred fifty-one thousand, one".