66677780457 has 12 divisors (see below), whose sum is σ = 96816605184. Its totient is φ = 44219120280.

The previous prime is 66677780447. The next prime is 66677780497. The reversal of 66677780457 is 75408777666.

It is a happy number.

It is not a de Polignac number, because 66677780457 - 2⁴ = 66677780441 is a prime.

It is a super-3 number, since 3×66677780457³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 66677780394 and 66677780403.

It is not an unprimeable number, because it can be changed into a prime (66677780417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19392633 + ... + 19396070.

It is an arithmetic number, because the mean of its divisors is an integer number (8068050432).

Almost surely, 2^66677780457 is an apocalyptic number.

It is an amenable number.

66677780457 is a deficient number, since it is larger than the sum of its proper divisors (30138824727).

66677780457 is a wasteful number, since it uses less digits than its factorization.

66677780457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38788900 (or 38788897 counting only the distinct ones).

The product of its (nonzero) digits is 82978560, while the sum is 63.

The spelling of 66677780457 in words is "sixty-six billion, six hundred seventy-seven million, seven hundred eighty thousand, four hundred fifty-seven".