65520137 has 4 divisors (see below), whose sum is σ = 66756420. Its totient is φ = 64283856.

The previous prime is 65520121. The next prime is 65520139. The reversal of 65520137 is 73102556.

65520137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 53816896 + 11703241 = 7336^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 65520137 - 2⁴ = 65520121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65520139) 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 3 ways as a sum of consecutive naturals, for example, 618062 + ... + 618167.

It is an arithmetic number, because the mean of its divisors is an integer number (16689105).

Almost surely, 2^65520137 is an apocalyptic number.

It is an amenable number.

65520137 is a deficient number, since it is larger than the sum of its proper divisors (1236283).

65520137 is a wasteful number, since it uses less digits than its factorization.

65520137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236282.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 65520137 is about 8094.4510005312. The cubic root of 65520137 is about 403.1422038368.

The spelling of 65520137 in words is "sixty-five million, five hundred twenty thousand, one hundred thirty-seven".