66487678396 has 6 divisors (see below), whose sum is σ = 116353437200. Its totient is φ = 33243839196.

The previous prime is 66487678393. The next prime is 66487678459. The reversal of 66487678396 is 69387678466.

It is a super-2 number, since 2×66487678396² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66487678393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310959796 + ... + 8310959803.

Almost surely, 2^66487678396 is an apocalyptic number.

It is an amenable number.

66487678396 is a deficient number, since it is larger than the sum of its proper divisors (49865758804).

66487678396 is a wasteful number, since it uses less digits than its factorization.

66487678396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16621919603 (or 16621919601 counting only the distinct ones).

The product of its digits is 438939648, while the sum is 70.

Adding to 66487678396 its sum of digits (70), we get a palindrome (66487678466).

The spelling of 66487678396 in words is "sixty-six billion, four hundred eighty-seven million, six hundred seventy-eight thousand, three hundred ninety-six".