65977761 has 4 divisors (see below), whose sum is σ = 87970352. Its totient is φ = 43985172.

The previous prime is 65977759. The next prime is 65977763. The reversal of 65977761 is 16777956.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (65977759) and next prime (65977763).

It is not a de Polignac number, because 65977761 - 2¹ = 65977759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65977761.

It is not an unprimeable number, because it can be changed into a prime (65977763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10996291 + ... + 10996296.

It is an arithmetic number, because the mean of its divisors is an integer number (21992588).

Almost surely, 2^65977761 is an apocalyptic number.

It is an amenable number.

65977761 is a deficient number, since it is larger than the sum of its proper divisors (21992591).

65977761 is a wasteful number, since it uses less digits than its factorization.

65977761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21992590.

The product of its digits is 555660, while the sum is 48.

The square root of 65977761 is about 8122.6695734838. The cubic root of 65977761 is about 404.0786064899.

The spelling of 65977761 in words is "sixty-five million, nine hundred seventy-seven thousand, seven hundred sixty-one".