65521253 has 8 divisors (see below), whose sum is σ = 78822720. Its totient is φ = 53205120.

The previous prime is 65521241. The next prime is 65521271. The reversal of 65521253 is 35212556.

It is a happy number.

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 65521253 - 2¹⁴ = 65504869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65521153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246188 + ... + 246453.

It is an arithmetic number, because the mean of its divisors is an integer number (9852840).

Almost surely, 2^65521253 is an apocalyptic number.

It is an amenable number.

65521253 is a deficient number, since it is larger than the sum of its proper divisors (13301467).

65521253 is a wasteful number, since it uses less digits than its factorization.

65521253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492667.

The product of its digits is 9000, while the sum is 29.

The square root of 65521253 is about 8094.5199363520. The cubic root of 65521253 is about 403.1444927217.

The spelling of 65521253 in words is "sixty-five million, five hundred twenty-one thousand, two hundred fifty-three".