66400640268088 has 24 divisors (see below), whose sum is σ = 144827927116200. Its totient is φ = 28457417257584.

The previous prime is 66400640268071. The next prime is 66400640268119. The reversal of 66400640268088 is 88086204600466.

66400640268088 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66400640268088² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84694693828 + ... + 84694694611.

It is an arithmetic number, because the mean of its divisors is an integer number (6034496963175).

Almost surely, 2^{66400640268088} is an apocalyptic number.

It is an amenable number.

66400640268088 is an abundant number, since it is smaller than the sum of its proper divisors (78427286848112).

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

66400640268088 is a wasteful number, since it uses less digits than its factorization.

66400640268088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169389388459 (or 169389388448 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 58.

The spelling of 66400640268088 in words is "sixty-six trillion, four hundred billion, six hundred forty million, two hundred sixty-eight thousand, eighty-eight".