6666477553 has 16 divisors (see below), whose sum is σ = 7081662976. Its totient is φ = 6264501120.

The previous prime is 6666477547. The next prime is 6666477583. The reversal of 6666477553 is 3557746666.

It is a cyclic number.

It is not a de Polignac number, because 6666477553 - 2¹³ = 6666469361 is a prime.

It is the 81649-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6666477494 and 6666477503.

It is not an unprimeable number, because it can be changed into a prime (6666477583) by changing a digit.

It is a nontrivial repunit in base 81648.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594325 + ... + 605437.

It is an arithmetic number, because the mean of its divisors is an integer number (442603936).

Almost surely, 2^6666477553 is an apocalyptic number.

It is an amenable number.

6666477553 is a deficient number, since it is larger than the sum of its proper divisors (415185423).

6666477553 is a wasteful number, since it uses less digits than its factorization.

6666477553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11704.

The product of its digits is 19051200, while the sum is 55.

The square root of 6666477553 is about 81648.5000045929. The cubic root of 6666477553 is about 1882.0542613164.

The spelling of 6666477553 in words is "six billion, six hundred sixty-six million, four hundred seventy-seven thousand, five hundred fifty-three".