64155565 has 8 divisors (see below), whose sum is σ = 77033880. Its totient is φ = 51292992.

The previous prime is 64155557. The next prime is 64155583. The reversal of 64155565 is 56555146.

It can be written as a sum of positive squares in 4 ways, for example, as 31505769 + 32649796 = 5613^2 + 5714^2 .

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 64155565 - 2³ = 64155557 is a prime.

It is a congruent 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, 8767 + ... + 14323.

It is an arithmetic number, because the mean of its divisors is an integer number (9629235).

Almost surely, 2^64155565 is an apocalyptic number.

It is an amenable number.

64155565 is a deficient number, since it is larger than the sum of its proper divisors (12878315).

64155565 is a wasteful number, since it uses less digits than its factorization.

64155565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7871.

The product of its digits is 90000, while the sum is 37.

The square root of 64155565 is about 8009.7169113521. The cubic root of 64155565 is about 400.3238315121.

The spelling of 64155565 in words is "sixty-four million, one hundred fifty-five thousand, five hundred sixty-five".