65545849261 has 12 divisors (see below), whose sum is σ = 66864964180. Its totient is φ = 64252281600.

The previous prime is 65545849249. The next prime is 65545849277. The reversal of 65545849261 is 16294854556.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 15102935236 + 50442914025 = 122894^2 + 224595^2 .

It is not a de Polignac number, because 65545849261 - 2⁷ = 65545849133 is a prime.

It is a super-2 number, since 2×65545849261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (10368000) is a multiple of the sum of its prime factors (20736).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65540849261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3363895 + ... + 3383323.

Almost surely, 2^65545849261 is an apocalyptic number.

It is an amenable number.

65545849261 is a deficient number, since it is larger than the sum of its proper divisors (1319114919).

65545849261 is a wasteful number, since it uses less digits than its factorization.

65545849261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20736 (or 20683 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 55.

The spelling of 65545849261 in words is "sixty-five billion, five hundred forty-five million, eight hundred forty-nine thousand, two hundred sixty-one".