55978191101 has 8 divisors (see below), whose sum is σ = 63978445440. Its totient is φ = 47978779248.

The previous prime is 55978191037. The next prime is 55978191103. The reversal of 55978191101 is 10119187955.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55978191101 - 2⁶ = 55978191037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55978191103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61166 + ... + 340143.

It is an arithmetic number, because the mean of its divisors is an integer number (7997305680).

Almost surely, 2^55978191101 is an apocalyptic number.

It is an amenable number.

55978191101 is a deficient number, since it is larger than the sum of its proper divisors (8000254339).

55978191101 is a wasteful number, since it uses less digits than its factorization.

55978191101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421243.

The product of its (nonzero) digits is 113400, while the sum is 47.

The spelling of 55978191101 in words is "fifty-five billion, nine hundred seventy-eight million, one hundred ninety-one thousand, one hundred one".