6565777340655 has 96 divisors (see below), whose sum is σ = 11802722967360. Its totient is φ = 3111648583680.

The previous prime is 6565777340641. The next prime is 6565777340699. The reversal of 6565777340655 is 5560437775656.

It is not a de Polignac number, because 6565777340655 - 2¹³ = 6565777332463 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24642045 + ... + 24907065.

It is an arithmetic number, because the mean of its divisors is an integer number (122945030910).

Almost surely, 2^{6565777340655} is an apocalyptic number.

6565777340655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6565777340655 is a deficient number, since it is larger than the sum of its proper divisors (5236945626705).

6565777340655 is a wasteful number, since it uses less digits than its factorization.

6565777340655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265421 (or 265408 counting only the distinct ones).

The product of its (nonzero) digits is 555660000, while the sum is 66.

The spelling of 6565777340655 in words is "six trillion, five hundred sixty-five billion, seven hundred seventy-seven million, three hundred forty thousand, six hundred fifty-five".