19219085645 has 4 divisors (see below), whose sum is σ = 23062902780. Its totient is φ = 15375268512.

The previous prime is 19219085629. The next prime is 19219085651. The reversal of 19219085645 is 54658091291.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3338297284 + 15880788361 = 57778^2 + 126019^2 .

It is a cyclic number.

It is not a de Polignac number, because 19219085645 - 2⁴ = 19219085629 is a prime.

It is a super-3 number, since 3×19219085645³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19219085593 and 19219085602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1921908560 + ... + 1921908569.

It is an arithmetic number, because the mean of its divisors is an integer number (5765725695).

Almost surely, 2^19219085645 is an apocalyptic number.

It is an amenable number.

19219085645 is a deficient number, since it is larger than the sum of its proper divisors (3843817135).

19219085645 is an equidigital number, since it uses as much as digits as its factorization.

19219085645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843817134.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 19219085645 in words is "nineteen billion, two hundred nineteen million, eighty-five thousand, six hundred forty-five".