66536416078381 has 16 divisors (see below), whose sum is σ = 67099613181120. Its totient is φ = 65975793811200.

The previous prime is 66536416078369. The next prime is 66536416078439. The reversal of 66536416078381 is 18387061463566.

It is a cyclic number.

It is not a de Polignac number, because 66536416078381 - 2⁴³ = 57740323056173 is a prime.

It is a super-2 number, since 2×66536416078381² (a number of 28 digits) contains 22 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 (66536416078331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146847781 + ... + 147300181.

It is an arithmetic number, because the mean of its divisors is an integer number (4193725823820).

Almost surely, 2^{66536416078381} is an apocalyptic number.

It is an amenable number.

66536416078381 is a deficient number, since it is larger than the sum of its proper divisors (563197102739).

66536416078381 is a wasteful number, since it uses less digits than its factorization.

66536416078381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455244.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 66536416078381 in words is "sixty-six trillion, five hundred thirty-six billion, four hundred sixteen million, seventy-eight thousand, three hundred eighty-one".