819745473402 has 24 divisors (see below), whose sum is σ = 1781204361300. Its totient is φ = 272465542080.

The previous prime is 819745473373. The next prime is 819745473427. The reversal of 819745473402 is 204374547918.

819745473402 is a `hidden beast` number, since 8 + 1 + 97 + 4 + 547 + 3 + 4 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 818863917921 + 881555481 = 904911^2 + 29691^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65239299 + ... + 65251862.

Almost surely, 2^819745473402 is an apocalyptic number.

819745473402 is an abundant number, since it is smaller than the sum of its proper divisors (961458887898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819745473402 is a wasteful number, since it uses less digits than its factorization.

819745473402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130491518 (or 130491515 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 819745473402 in words is "eight hundred nineteen billion, seven hundred forty-five million, four hundred seventy-three thousand, four hundred two".