65520661499 has 8 divisors (see below), whose sum is σ = 68376372480. Its totient is φ = 62665532776.

The previous prime is 65520661487. The next prime is 65520661501. The reversal of 65520661499 is 99416602556.

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

It is a cyclic number.

It is not a de Polignac number, because 65520661499 - 2⁴ = 65520661483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65520661499.

It is not an unprimeable number, because it can be changed into a prime (65520661099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92714 + ... + 373680.

It is an arithmetic number, because the mean of its divisors is an integer number (8547046560).

Almost surely, 2^65520661499 is an apocalyptic number.

65520661499 is a deficient number, since it is larger than the sum of its proper divisors (2855710981).

65520661499 is a wasteful number, since it uses less digits than its factorization.

65520661499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291129.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 65520661499 in words is "sixty-five billion, five hundred twenty million, six hundred sixty-one thousand, four hundred ninety-nine".