65421565 has 8 divisors (see below), whose sum is σ = 85642848. Its totient is φ = 47579280.

The previous prime is 65421529. The next prime is 65421571. The reversal of 65421565 is 56512456.

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

It is not a de Polignac number, because 65421565 - 2²³ = 57032957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65421565.

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, 594687 + ... + 594796.

It is an arithmetic number, because the mean of its divisors is an integer number (10705356).

Almost surely, 2^65421565 is an apocalyptic number.

It is an amenable number.

65421565 is a deficient number, since it is larger than the sum of its proper divisors (20221283).

65421565 is a wasteful number, since it uses less digits than its factorization.

65421565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189499.

The product of its digits is 36000, while the sum is 34.

The square root of 65421565 is about 8088.3598460998. The cubic root of 65421565 is about 402.9399327994.

The spelling of 65421565 in words is "sixty-five million, four hundred twenty-one thousand, five hundred sixty-five".