65684149 has 4 divisors (see below), whose sum is σ = 65745664. Its totient is φ = 65622636.

The previous prime is 65684147. The next prime is 65684161. The reversal of 65684149 is 94148656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65684149 - 2¹ = 65684147 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 (65684147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29127 + ... + 31300.

It is an arithmetic number, because the mean of its divisors is an integer number (16436416).

Almost surely, 2^65684149 is an apocalyptic number.

It is an amenable number.

65684149 is a deficient number, since it is larger than the sum of its proper divisors (61515).

65684149 is a wasteful number, since it uses less digits than its factorization.

65684149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61514.

The product of its digits is 207360, while the sum is 43.

The square root of 65684149 is about 8104.5758062961. The cubic root of 65684149 is about 403.4783094853.

The spelling of 65684149 in words is "sixty-five million, six hundred eighty-four thousand, one hundred forty-nine".