64065650521615 has 4 divisors (see below), whose sum is σ = 76878780625944. Its totient is φ = 51252520417288.

The previous prime is 64065650521531. The next prime is 64065650521637. The reversal of 64065650521615 is 51612505656046.

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

It is a cyclic number.

It is not a de Polignac number, because 64065650521615 - 2¹⁷ = 64065650390543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6406565052157 + ... + 6406565052166.

It is an arithmetic number, because the mean of its divisors is an integer number (19219695156486).

Almost surely, 2^{64065650521615} is an apocalyptic number.

64065650521615 is a deficient number, since it is larger than the sum of its proper divisors (12813130104329).

64065650521615 is a wasteful number, since it uses less digits than its factorization.

64065650521615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12813130104328.

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 64065650521615 in words is "sixty-four trillion, sixty-five billion, six hundred fifty million, five hundred twenty-one thousand, six hundred fifteen".