66777367440344 has 16 divisors (see below), whose sum is σ = 136590069764520. Its totient is φ = 30353348836480.

The previous prime is 66777367440341. The next prime is 66777367440389. The reversal of 66777367440344 is 44304476377766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66777367440341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379416860369 + ... + 379416860544.

Almost surely, 2^{66777367440344} is an apocalyptic number.

It is an amenable number.

66777367440344 is an abundant number, since it is smaller than the sum of its proper divisors (69812702324176).

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

66777367440344 is a wasteful number, since it uses less digits than its factorization.

66777367440344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758833720930 (or 758833720926 counting only the distinct ones).

The product of its (nonzero) digits is 1194891264, while the sum is 68.

The spelling of 66777367440344 in words is "sixty-six trillion, seven hundred seventy-seven billion, three hundred sixty-seven million, four hundred forty thousand, three hundred forty-four".