65520000001 has 4 divisors (see below), whose sum is σ = 65524202500. Its totient is φ = 65515797504.

The previous prime is 65519999917. The next prime is 65520000047. The reversal of 65520000001 is 10000002556.

It is a happy number.

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 15489047025 + 50030952976 = 124455^2 + 223676^2 .

It is a cyclic number.

It is not a de Polignac number, because 65520000001 - 2¹¹ = 65519997953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65520000901) 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, 2077776 + ... + 2109073.

It is an arithmetic number, because the mean of its divisors is an integer number (16381050625).

Almost surely, 2^65520000001 is an apocalyptic number.

It is an amenable number.

65520000001 is a deficient number, since it is larger than the sum of its proper divisors (4202499).

65520000001 is a wasteful number, since it uses less digits than its factorization.

65520000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202498.

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 65520000001 its reverse (10000002556), we get a palindrome (75520002557).

The spelling of 65520000001 in words is "sixty-five billion, five hundred twenty million, one", and thus it is an aban number.