66168003381 has 48 divisors (see below), whose sum is σ = 99316808640. Its totient is φ = 39107246080.

The previous prime is 66168003379. The next prime is 66168003383. The reversal of 66168003381 is 18330086166.

It is an interprime number because it is at equal distance from previous prime (66168003379) and next prime (66168003383).

It is not a de Polignac number, because 66168003381 - 2¹ = 66168003379 is a prime.

It is a super-2 number, since 2×66168003381² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66168003383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 998770 + ... + 1062956.

It is an arithmetic number, because the mean of its divisors is an integer number (2069100180).

Almost surely, 2^66168003381 is an apocalyptic number.

It is an amenable number.

66168003381 is a deficient number, since it is larger than the sum of its proper divisors (33148805259).

66168003381 is a wasteful number, since it uses less digits than its factorization.

66168003381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64294 (or 64277 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 66168003381 in words is "sixty-six billion, one hundred sixty-eight million, three thousand, three hundred eighty-one".