55398391819 has 2 divisors, whose sum is σ = 55398391820. Its totient is φ = 55398391818.

The previous prime is 55398391757. The next prime is 55398391837. The reversal of 55398391819 is 91819389355.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55398391819 is a prime.

It is a super-2 number, since 2×55398391819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55398391879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27699195909 + 27699195910.

It is an arithmetic number, because the mean of its divisors is an integer number (27699195910).

Almost surely, 2^55398391819 is an apocalyptic number.

55398391819 is a deficient number, since it is larger than the sum of its proper divisors (1).

55398391819 is an equidigital number, since it uses as much as digits as its factorization.

55398391819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10497600, while the sum is 61.

The spelling of 55398391819 in words is "fifty-five billion, three hundred ninety-eight million, three hundred ninety-one thousand, eight hundred nineteen".