66824839162138 has 8 divisors (see below), whose sum is σ = 100237950865332. Its totient is φ = 33412188873696.

The previous prime is 66824839162129. The next prime is 66824839162139. The reversal of 66824839162138 is 83126193842866.

It can be written as a sum of positive squares in 2 ways, for example, as 66712417766289 + 112421395849 = 8167767^2 + 335293^2 .

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

It is a super-2 number, since 2×66824839162138² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66824839162139) 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, 114991395 + ... + 115571062.

Almost surely, 2^{66824839162138} is an apocalyptic number.

66824839162138 is a deficient number, since it is larger than the sum of its proper divisors (33413111703194).

66824839162138 is a wasteful number, since it uses less digits than its factorization.

66824839162138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230707376.

The product of its digits is 143327232, while the sum is 67.

The spelling of 66824839162138 in words is "sixty-six trillion, eight hundred twenty-four billion, eight hundred thirty-nine million, one hundred sixty-two thousand, one hundred thirty-eight".