65471661 has 6 divisors (see below), whose sum is σ = 94570190. Its totient is φ = 43647768.

The previous prime is 65471657. The next prime is 65471687. The reversal of 65471661 is 16617456.

It can be written as a sum of positive squares in only one way, i.e., 39614436 + 25857225 = 6294^2 + 5085^2 .

It is not a de Polignac number, because 65471661 - 2² = 65471657 is a prime.

It is a super-3 number, since 3×65471661³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65471621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3637306 + ... + 3637323.

Almost surely, 2^65471661 is an apocalyptic number.

It is an amenable number.

65471661 is a deficient number, since it is larger than the sum of its proper divisors (29098529).

65471661 is a wasteful number, since it uses less digits than its factorization.

65471661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274635 (or 7274632 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 65471661 is about 8091.4560494388. The cubic root of 65471661 is about 403.0427558198.

The spelling of 65471661 in words is "sixty-five million, four hundred seventy-one thousand, six hundred sixty-one".