55398391879 has 2 divisors, whose sum is σ = 55398391880. Its totient is φ = 55398391878.

The previous prime is 55398391877. The next prime is 55398391891. The reversal of 55398391879 is 97819389355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55398391879 - 2¹ = 55398391877 is a prime.

It is a super-3 number, since 3×55398391879³ (a number of 33 digits) contains 333 as substring.

Together with 55398391877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55398391871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699195939 + 27699195940.

It is an arithmetic number, because the mean of its divisors is an integer number (27699195940).

Almost surely, 2^55398391879 is an apocalyptic number.

55398391879 is a deficient number, since it is larger than the sum of its proper divisors (1).

55398391879 is an equidigital number, since it uses as much as digits as its factorization.

55398391879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73483200, while the sum is 67.

The spelling of 55398391879 in words is "fifty-five billion, three hundred ninety-eight million, three hundred ninety-one thousand, eight hundred seventy-nine".