66887488478866 has 16 divisors (see below), whose sum is σ = 109460066259168. Its totient is φ = 30401233747200.

The previous prime is 66887488478809. The next prime is 66887488478897.

66887488478866 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66887488478866² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108190095 + ... + 108806578.

It is an arithmetic number, because the mean of its divisors is an integer number (6841254141198).

Almost surely, 2^{66887488478866} is an apocalyptic number.

66887488478866 is a deficient number, since it is larger than the sum of its proper divisors (42572577780302).

66887488478866 is a wasteful number, since it uses less digits than its factorization.

66887488478866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217010697.

The product of its digits is 266355081216, while the sum is 94.

The spelling of 66887488478866 in words is "sixty-six trillion, eight hundred eighty-seven billion, four hundred eighty-eight million, four hundred seventy-eight thousand, eight hundred sixty-six".