65977645 has 4 divisors (see below), whose sum is σ = 79173180. Its totient is φ = 52782112.

The previous prime is 65977627. The next prime is 65977669. The reversal of 65977645 is 54677956.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19342404 + 46635241 = 4398^2 + 6829^2 .

It is a cyclic number.

It is not a de Polignac number, because 65977645 - 2¹¹ = 65975597 is a prime.

It is a super-3 number, since 3×65977645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6597760 + ... + 6597769.

It is an arithmetic number, because the mean of its divisors is an integer number (19793295).

Almost surely, 2^65977645 is an apocalyptic number.

It is an amenable number.

65977645 is a deficient number, since it is larger than the sum of its proper divisors (13195535).

65977645 is a wasteful number, since it uses less digits than its factorization.

65977645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13195534.

The product of its digits is 1587600, while the sum is 49.

The square root of 65977645 is about 8122.6624329711. The cubic root of 65977645 is about 404.0783696771.

The spelling of 65977645 in words is "sixty-five million, nine hundred seventy-seven thousand, six hundred forty-five".