549778021619 has 2 divisors, whose sum is σ = 549778021620. Its totient is φ = 549778021618.

The previous prime is 549778021609. The next prime is 549778021673. The reversal of 549778021619 is 916120877945.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549778021619 - 2⁴ = 549778021603 is a prime.

It is a super-2 number, since 2×549778021619² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (549778021609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274889010809 + 274889010810.

It is an arithmetic number, because the mean of its divisors is an integer number (274889010810).

Almost surely, 2^549778021619 is an apocalyptic number.

549778021619 is a deficient number, since it is larger than the sum of its proper divisors (1).

549778021619 is an equidigital number, since it uses as much as digits as its factorization.

549778021619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 549778021619 in words is "five hundred forty-nine billion, seven hundred seventy-eight million, twenty-one thousand, six hundred nineteen".