65777261 has 12 divisors (see below), whose sum is σ = 72597024. Its totient is φ = 59103000.

The previous prime is 65777227. The next prime is 65777269. The reversal of 65777261 is 16277756.

It is not a de Polignac number, because 65777261 - 2¹⁰ = 65776237 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 (65777269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330440 + ... + 330638.

It is an arithmetic number, because the mean of its divisors is an integer number (6049752).

Almost surely, 2^65777261 is an apocalyptic number.

It is an amenable number.

65777261 is a deficient number, since it is larger than the sum of its proper divisors (6819763).

65777261 is a wasteful number, since it uses less digits than its factorization.

65777261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 361 counting only the distinct ones).

The product of its digits is 123480, while the sum is 41.

The square root of 65777261 is about 8110.3181811813. The cubic root of 65777261 is about 403.6688726313.

The spelling of 65777261 in words is "sixty-five million, seven hundred seventy-seven thousand, two hundred sixty-one".