197487804816 has 135 divisors (see below), whose sum is σ = 572855673091. Its totient is φ = 63509521152.

The previous prime is 197487804803. The next prime is 197487804823. The reversal of 197487804816 is 618408784791.

The square root of 197487804816 is 444396.

It is a perfect power (a square), and thus also a powerful number.

197487804816 is a `hidden beast` number, since 1 + 9 + 74 + 8 + 7 + 80 + 481 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6609690000 + 190878114816 = 81300^2 + 436896^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 154649170 + ... + 154650446.

Almost surely, 2^197487804816 is an apocalyptic number.

197487804816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

197487804816 is the 444396-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197487804816

197487804816 is an abundant number, since it is smaller than the sum of its proper divisors (375367868275).

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

197487804816 is an equidigital number, since it uses as much as digits as its factorization.

197487804816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 21676032, while the sum is 63.

The spelling of 197487804816 in words is "one hundred ninety-seven billion, four hundred eighty-seven million, eight hundred four thousand, eight hundred sixteen".