66885080781 has 8 divisors (see below), whose sum is σ = 92056885504. Its totient is φ = 43151664960.

The previous prime is 66885080777. The next prime is 66885080803. The reversal of 66885080781 is 18708058866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66885080781 - 2² = 66885080777 is a prime.

It is a super-2 number, since 2×66885080781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66885080711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359597116 + ... + 359597301.

It is an arithmetic number, because the mean of its divisors is an integer number (11507110688).

Almost surely, 2^66885080781 is an apocalyptic number.

It is an amenable number.

66885080781 is a deficient number, since it is larger than the sum of its proper divisors (25171804723).

66885080781 is a wasteful number, since it uses less digits than its factorization.

66885080781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719194451.

The product of its (nonzero) digits is 5160960, while the sum is 57.

The spelling of 66885080781 in words is "sixty-six billion, eight hundred eighty-five million, eighty thousand, seven hundred eighty-one".