197697868450 has 12 divisors (see below), whose sum is σ = 367718035410. Its totient is φ = 79079147360.

The previous prime is 197697868447. The next prime is 197697868451. The reversal of 197697868450 is 54868796791.

It can be written as a sum of positive squares in 3 ways, for example, as 153169694161 + 44528174289 = 391369^2 + 211017^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 197697868450.

It is not an unprimeable number, because it can be changed into a prime (197697868451) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1976978635 + ... + 1976978734.

Almost surely, 2^197697868450 is an apocalyptic number.

197697868450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197697868450 is a deficient number, since it is larger than the sum of its proper divisors (170020166960).

197697868450 is a wasteful number, since it uses less digits than its factorization.

197697868450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953957381 (or 3953957376 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 70.

The spelling of 197697868450 in words is "one hundred ninety-seven billion, six hundred ninety-seven million, eight hundred sixty-eight thousand, four hundred fifty".