197398859857 has 8 divisors (see below), whose sum is σ = 199918080360. Its totient is φ = 194890713600.

The previous prime is 197398859843. The next prime is 197398859869. The reversal of 197398859857 is 758958893791.

It can be written as a sum of positive squares in 4 ways, for example, as 116646839296 + 80752020561 = 341536^2 + 284169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197398859857 - 2²⁷ = 197264642129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197398859257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732682 + ... + 2803987.

It is an arithmetic number, because the mean of its divisors is an integer number (24989760045).

Almost surely, 2^197398859857 is an apocalyptic number.

It is an amenable number.

197398859857 is a deficient number, since it is larger than the sum of its proper divisors (2519220503).

197398859857 is a wasteful number, since it uses less digits than its factorization.

197398859857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5537123.

The product of its digits is 1371686400, while the sum is 79.

The spelling of 197398859857 in words is "one hundred ninety-seven billion, three hundred ninety-eight million, eight hundred fifty-nine thousand, eight hundred fifty-seven".