66670055 has 4 divisors (see below), whose sum is σ = 80004072. Its totient is φ = 53336040.

The previous prime is 66670049. The next prime is 66670063. The reversal of 66670055 is 55007666.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66670055 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66669997 and 66670024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6667001 + ... + 6667010.

It is an arithmetic number, because the mean of its divisors is an integer number (20001018).

Almost surely, 2^66670055 is an apocalyptic number.

66670055 is a deficient number, since it is larger than the sum of its proper divisors (13334017).

66670055 is a wasteful number, since it uses less digits than its factorization.

66670055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13334016.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 66670055 is about 8165.1732988345. The cubic root of 66670055 is about 405.4870024311.

The spelling of 66670055 in words is "sixty-six million, six hundred seventy thousand, fifty-five".