819594974399 has 4 divisors (see below), whose sum is σ = 819603496536. Its totient is φ = 819586452264.

The previous prime is 819594974357. The next prime is 819594974431. The reversal of 819594974399 is 993479495918.

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 819594974399 - 2¹² = 819594970303 is a prime.

It is a super-2 number, since 2×819594974399² (a number of 25 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 (819594974339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4115144 + ... + 4309709.

It is an arithmetic number, because the mean of its divisors is an integer number (204900874134).

Almost surely, 2^819594974399 is an apocalyptic number.

819594974399 is a deficient number, since it is larger than the sum of its proper divisors (8522137).

819594974399 is an equidigital number, since it uses as much as digits as its factorization.

819594974399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522136.

The product of its digits is 793618560, while the sum is 77.

The spelling of 819594974399 in words is "eight hundred nineteen billion, five hundred ninety-four million, nine hundred seventy-four thousand, three hundred ninety-nine".