65778977 has 8 divisors (see below), whose sum is σ = 72470592. Its totient is φ = 59206000.

The previous prime is 65778961. The next prime is 65778983. The reversal of 65778977 is 77987756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65778977 - 2⁴ = 65778961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65778907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28493 + ... + 30714.

It is an arithmetic number, because the mean of its divisors is an integer number (9058824).

Almost surely, 2^65778977 is an apocalyptic number.

It is an amenable number.

65778977 is a deficient number, since it is larger than the sum of its proper divisors (6691615).

65778977 is a wasteful number, since it uses less digits than its factorization.

65778977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59319.

The product of its digits is 5186160, while the sum is 56.

The square root of 65778977 is about 8110.4239716552. The cubic root of 65778977 is about 403.6723829110.

The spelling of 65778977 in words is "sixty-five million, seven hundred seventy-eight thousand, nine hundred seventy-seven".