819190649869 has 8 divisors (see below), whose sum is σ = 823113741240. Its totient is φ = 815274061056.

The previous prime is 819190649861. The next prime is 819190649881. The reversal of 819190649869 is 968946091918.

It can be written as a sum of positive squares in 4 ways, for example, as 15051609225 + 804139040644 = 122685^2 + 896738^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 819190649869 - 2³ = 819190649861 is a prime.

It is a super-2 number, since 2×819190649869² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 819190649798 and 819190649807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819190649861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1372984 + ... + 1877089.

It is an arithmetic number, because the mean of its divisors is an integer number (102889217655).

Almost surely, 2^819190649869 is an apocalyptic number.

It is an amenable number.

819190649869 is a deficient number, since it is larger than the sum of its proper divisors (3923091371).

819190649869 is a wasteful number, since it uses less digits than its factorization.

819190649869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251279.

The product of its (nonzero) digits is 60466176, while the sum is 70.

The spelling of 819190649869 in words is "eight hundred nineteen billion, one hundred ninety million, six hundred forty-nine thousand, eight hundred sixty-nine".