64516505 has 8 divisors (see below), whose sum is σ = 77513352. Its totient is φ = 51550848.

The previous prime is 64516483. The next prime is 64516523. The reversal of 64516505 is 50561546.

It can be written as a sum of positive squares in 4 ways, for example, as 22771984 + 41744521 = 4772^2 + 6461^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64516505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2972 + ... + 11741.

It is an arithmetic number, because the mean of its divisors is an integer number (9689169).

Almost surely, 2^64516505 is an apocalyptic number.

It is an amenable number.

64516505 is a deficient number, since it is larger than the sum of its proper divisors (12996847).

64516505 is a wasteful number, since it uses less digits than its factorization.

64516505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15595.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 64516505 is about 8032.2166927941. The cubic root of 64516505 is about 401.0731702723.

The spelling of 64516505 in words is "sixty-four million, five hundred sixteen thousand, five hundred five".