66776017553 has 12 divisors (see below), whose sum is σ = 79777779648. Its totient is φ = 54748036200.

The previous prime is 66776017543. The next prime is 66776017597. The reversal of 66776017553 is 35571067766.

It is not a de Polignac number, because 66776017553 - 2⁶ = 66776017489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66776017495 and 66776017504.

It is not an unprimeable number, because it can be changed into a prime (66776017543) 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, 9012773 + ... + 9020178.

It is an arithmetic number, because the mean of its divisors is an integer number (6648148304).

Almost surely, 2^66776017553 is an apocalyptic number.

It is an amenable number.

66776017553 is a deficient number, since it is larger than the sum of its proper divisors (13001762095).

66776017553 is a wasteful number, since it uses less digits than its factorization.

66776017553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18033004 (or 18032981 counting only the distinct ones).

The product of its (nonzero) digits is 5556600, while the sum is 53.

The spelling of 66776017553 in words is "sixty-six billion, seven hundred seventy-six million, seventeen thousand, five hundred fifty-three".