55398697919 has 4 divisors (see below), whose sum is σ = 55404551760. Its totient is φ = 55392844080.

The previous prime is 55398697877. The next prime is 55398697933. The reversal of 55398697919 is 91979689355.

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

It is a cyclic number.

It is not a de Polignac number, because 55398697919 - 2¹⁶ = 55398632383 is a prime.

It is a super-2 number, since 2×55398697919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55398691919) 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 3 ways as a sum of consecutive naturals, for example, 2912702 + ... + 2931659.

It is an arithmetic number, because the mean of its divisors is an integer number (13851137940).

Almost surely, 2^55398697919 is an apocalyptic number.

55398697919 is a deficient number, since it is larger than the sum of its proper divisors (5853841).

55398697919 is an equidigital number, since it uses as much as digits as its factorization.

55398697919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853840.

The product of its digits is 165337200, while the sum is 71.

The spelling of 55398697919 in words is "fifty-five billion, three hundred ninety-eight million, six hundred ninety-seven thousand, nine hundred nineteen".