55666017977 has 4 divisors (see below), whose sum is σ = 55915641600. Its totient is φ = 55416394356.

The previous prime is 55666017949. The next prime is 55666017997. The reversal of 55666017977 is 77971066655.

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 a de Polignac number, because none of the positive numbers 2^k-55666017977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55666017917) 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, 124811477 + ... + 124811922.

It is an arithmetic number, because the mean of its divisors is an integer number (13978910400).

Almost surely, 2^55666017977 is an apocalyptic number.

It is an amenable number.

55666017977 is a deficient number, since it is larger than the sum of its proper divisors (249623623).

55666017977 is a wasteful number, since it uses less digits than its factorization.

55666017977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249623622.

The product of its (nonzero) digits is 16669800, while the sum is 59.

The spelling of 55666017977 in words is "fifty-five billion, six hundred sixty-six million, seventeen thousand, nine hundred seventy-seven".