65521671 has 8 divisors (see below), whose sum is σ = 91960320. Its totient is φ = 41382072.

The previous prime is 65521669. The next prime is 65521691. The reversal of 65521671 is 17612556.

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

It is not a de Polignac number, because 65521671 - 2¹ = 65521669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65521601) 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, 574695 + ... + 574808.

It is an arithmetic number, because the mean of its divisors is an integer number (11495040).

Almost surely, 2^65521671 is an apocalyptic number.

65521671 is a deficient number, since it is larger than the sum of its proper divisors (26438649).

65521671 is a wasteful number, since it uses less digits than its factorization.

65521671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149525.

The product of its digits is 12600, while the sum is 33.

The square root of 65521671 is about 8094.5457562485. The cubic root of 65521671 is about 403.1453500213.

The spelling of 65521671 in words is "sixty-five million, five hundred twenty-one thousand, six hundred seventy-one".