66552553777 has 4 divisors (see below), whose sum is σ = 66553436656. Its totient is φ = 66551670900.

The previous prime is 66552553759. The next prime is 66552553799. The reversal of 66552553777 is 77735525566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66552553777 - 2³⁵ = 32192815409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66552503777) 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, 316599 + ... + 483052.

It is an arithmetic number, because the mean of its divisors is an integer number (16638359164).

Almost surely, 2^66552553777 is an apocalyptic number.

It is an amenable number.

66552553777 is a deficient number, since it is larger than the sum of its proper divisors (882879).

66552553777 is an equidigital number, since it uses as much as digits as its factorization.

66552553777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882878.

The product of its digits is 46305000, while the sum is 58.

The spelling of 66552553777 in words is "sixty-six billion, five hundred fifty-two million, five hundred fifty-three thousand, seven hundred seventy-seven".