196549781540 has 48 divisors (see below), whose sum is σ = 472021036032. Its totient is φ = 67345416576.

The previous prime is 196549781489. The next prime is 196549781581. The reversal of 196549781540 is 45187945691.

It is a self number, because there is not a number n which added to its sum of digits gives 196549781540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228587 + ... + 667346.

It is an arithmetic number, because the mean of its divisors is an integer number (9833771584).

Almost surely, 2^196549781540 is an apocalyptic number.

196549781540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

196549781540 is an abundant number, since it is smaller than the sum of its proper divisors (275471254492).

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

196549781540 is a wasteful number, since it uses less digits than its factorization.

196549781540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897516 (or 897514 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 59.

The spelling of 196549781540 in words is "one hundred ninety-six billion, five hundred forty-nine million, seven hundred eighty-one thousand, five hundred forty".