66010116665501 has 4 divisors (see below), whose sum is σ = 66010155270972. Its totient is φ = 66010078060032.

The previous prime is 66010116665447. The next prime is 66010116665639. The reversal of 66010116665501 is 10556661101066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19621090384900 + 46389026280601 = 4429570^2 + 6810949^2 .

It is a cyclic number.

It is not a de Polignac number, because 66010116665501 - 2³⁸ = 65735238758557 is a prime.

It is a super-3 number, since 3×66010116665501³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66010116865501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16613006 + ... + 20199311.

It is an arithmetic number, because the mean of its divisors is an integer number (16502538817743).

Almost surely, 2^{66010116665501} is an apocalyptic number.

It is an amenable number.

66010116665501 is a deficient number, since it is larger than the sum of its proper divisors (38605471).

66010116665501 is a wasteful number, since it uses less digits than its factorization.

66010116665501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38605470.

The product of its (nonzero) digits is 194400, while the sum is 44.

Adding to 66010116665501 its reverse (10556661101066), we get a palindrome (76566777766567).

The spelling of 66010116665501 in words is "sixty-six trillion, ten billion, one hundred sixteen million, six hundred sixty-five thousand, five hundred one".