197803661 has 24 divisors (see below), whose sum is σ = 231483840. Its totient is φ = 168410880.

The previous prime is 197803649. The next prime is 197803667. The reversal of 197803661 is 166308791.

It is not a de Polignac number, because 197803661 - 2¹⁰ = 197802637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197803667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222560 + ... + 223446.

It is an arithmetic number, because the mean of its divisors is an integer number (9645160).

Almost surely, 2^197803661 is an apocalyptic number.

197803661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197803661 is a deficient number, since it is larger than the sum of its proper divisors (33680179).

197803661 is a wasteful number, since it uses less digits than its factorization.

197803661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 197803661 is about 14064.2689465183. The cubic root of 197803661 is about 582.6549518698.

The spelling of 197803661 in words is "one hundred ninety-seven million, eight hundred three thousand, six hundred sixty-one".