65421205 has 4 divisors (see below), whose sum is σ = 78505452. Its totient is φ = 52336960.

The previous prime is 65421197. The next prime is 65421211. The reversal of 65421205 is 50212456.

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 15944049 + 49477156 = 3993^2 + 7034^2 .

It is not a de Polignac number, because 65421205 - 2³ = 65421197 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 65421205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6542116 + ... + 6542125.

It is an arithmetic number, because the mean of its divisors is an integer number (19626363).

Almost surely, 2^65421205 is an apocalyptic number.

It is an amenable number.

65421205 is a deficient number, since it is larger than the sum of its proper divisors (13084247).

65421205 is a wasteful number, since it uses less digits than its factorization.

65421205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13084246.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 65421205 is about 8088.3375918665. The cubic root of 65421205 is about 402.9391937024.

The spelling of 65421205 in words is "sixty-five million, four hundred twenty-one thousand, two hundred five".