66886777667052 has 144 divisors (see below), whose sum is σ = 204661728677952. Its totient is φ = 17980480880640.

The previous prime is 66886777667041. The next prime is 66886777667131. The reversal of 66886777667052 is 25076677768866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10562988 + ... + 15663660.

It is an arithmetic number, because the mean of its divisors is an integer number (1421262004708).

Almost surely, 2^{66886777667052} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66886777667052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102330864338976).

66886777667052 is an abundant number, since it is smaller than the sum of its proper divisors (137774951010900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66886777667052 is a wasteful number, since it uses less digits than its factorization.

66886777667052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103768 (or 5103763 counting only the distinct ones).

The product of its (nonzero) digits is 11948912640, while the sum is 81.

The spelling of 66886777667052 in words is "sixty-six trillion, eight hundred eighty-six billion, seven hundred seventy-seven million, six hundred sixty-seven thousand, fifty-two".