65665016541 has 48 divisors (see below), whose sum is σ = 97688650800. Its totient is φ = 42489308160.

The previous prime is 65665016503. The next prime is 65665016569. The reversal of 65665016541 is 14561056656.

65665016541 is a `hidden beast` number, since 6 + 56 + 6 + 50 + 1 + 6 + 541 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 44677699641 + 20987316900 = 211371^2 + 144870^2 .

It is not a de Polignac number, because 65665016541 - 2⁹ = 65665016029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65665216541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12840201 + ... + 12845313.

It is an arithmetic number, because the mean of its divisors is an integer number (2035180225).

Almost surely, 2^65665016541 is an apocalyptic number.

65665016541 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65665016541 is a deficient number, since it is larger than the sum of its proper divisors (32023634259).

65665016541 is a wasteful number, since it uses less digits than its factorization.

65665016541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5486 (or 5483 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 65665016541 in words is "sixty-five billion, six hundred sixty-five million, sixteen thousand, five hundred forty-one".