197857520641 has 48 divisors (see below), whose sum is σ = 225271569600. Its totient is φ = 173559070080.

The previous prime is 197857520621. The next prime is 197857520647. The reversal of 197857520641 is 146025758791.

It is not a de Polignac number, because 197857520641 - 2¹³ = 197857512449 is a prime.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (197857520647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 178410195 + ... + 178411303.

It is an arithmetic number, because the mean of its divisors is an integer number (4693157700).

Almost surely, 2^197857520641 is an apocalyptic number.

197857520641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197857520641 is a deficient number, since it is larger than the sum of its proper divisors (27414048959).

197857520641 is a wasteful number, since it uses less digits than its factorization.

197857520641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1619 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 197857520641 in words is "one hundred ninety-seven billion, eight hundred fifty-seven million, five hundred twenty thousand, six hundred forty-one".