66400066066644 has 24 divisors (see below), whose sum is σ = 172148319432320. Its totient is φ = 22133355355512.

The previous prime is 66400066066639. The next prime is 66400066066673. The reversal of 66400066066644 is 44666066000466.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 307407713164 + ... + 307407713379.

Almost surely, 2^{66400066066644} is an apocalyptic number.

It is an amenable number.

66400066066644 is an abundant number, since it is smaller than the sum of its proper divisors (105748253365676).

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

66400066066644 is a wasteful number, since it uses less digits than its factorization.

66400066066644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614815426556 (or 614815426548 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 54.

The spelling of 66400066066644 in words is "sixty-six trillion, four hundred billion, sixty-six million, sixty-six thousand, six hundred forty-four".