199549273408 has 14 divisors (see below), whose sum is σ = 395980589546. Its totient is φ = 99774636672.

The previous prime is 199549273369. The next prime is 199549273421. The reversal of 199549273408 is 804372945991.

It can be written as a sum of positive squares in only one way, i.e., 170760685824 + 28788587584 = 413232^2 + 169672^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1558978635 + ... + 1558978762.

Almost surely, 2^199549273408 is an apocalyptic number.

It is an amenable number.

199549273408 is a deficient number, since it is larger than the sum of its proper divisors (196431316138).

199549273408 is an equidigital number, since it uses as much as digits as its factorization.

199549273408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117957409 (or 3117957399 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 199549273408 in words is "one hundred ninety-nine billion, five hundred forty-nine million, two hundred seventy-three thousand, four hundred eight".