66050005011601 has 8 divisors (see below), whose sum is σ = 71267302033704. Its totient is φ = 60852211904640.

The previous prime is 66050005011569. The next prime is 66050005011691. The reversal of 66050005011601 is 10611050005066.

It can be written as a sum of positive squares in 4 ways, for example, as 723522061201 + 65326482950400 = 850601^2 + 8082480^2 .

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

It is not a de Polignac number, because 66050005011601 - 2⁵ = 66050005011569 is a prime.

It is a super-2 number, since 2×66050005011601² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66050005011691) 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, 4875971746 + ... + 4875985291.

It is an arithmetic number, because the mean of its divisors is an integer number (8908412754213).

Almost surely, 2^{66050005011601} is an apocalyptic number.

It is an amenable number.

66050005011601 is a deficient number, since it is larger than the sum of its proper divisors (5217297022103).

66050005011601 is a wasteful number, since it uses less digits than its factorization.

66050005011601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9751957571.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 66050005011601 its reverse (10611050005066), we get a palindrome (76661055016667).

The spelling of 66050005011601 in words is "sixty-six trillion, fifty billion, five million, eleven thousand, six hundred one".