65997645 has 32 divisors (see below), whose sum is σ = 121094400. Its totient is φ = 30067200.

The previous prime is 65997643. The next prime is 65997653. The reversal of 65997645 is 54679956.

It is not a de Polignac number, because 65997645 - 2¹ = 65997643 is a prime.

It is a super-3 number, since 3×65997645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65997641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35745 + ... + 37545.

It is an arithmetic number, because the mean of its divisors is an integer number (3784200).

Almost surely, 2^65997645 is an apocalyptic number.

It is an amenable number.

65997645 is a deficient number, since it is larger than the sum of its proper divisors (55096755).

65997645 is a wasteful number, since it uses less digits than its factorization.

65997645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165.

The product of its digits is 2041200, while the sum is 51.

The square root of 65997645 is about 8123.8934631124. The cubic root of 65997645 is about 404.1191953787.

The spelling of 65997645 in words is "sixty-five million, nine hundred ninety-seven thousand, six hundred forty-five".