197663653 has 4 divisors (see below), whose sum is σ = 215633088. Its totient is φ = 179694220.

The previous prime is 197663639. The next prime is 197663677. The reversal of 197663653 is 356366791.

197663653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 356366791 = 11 ⋅32396981.

It is a cyclic number.

It is not a de Polignac number, because 197663653 - 2¹⁷ = 197532581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197663603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8984701 + ... + 8984722.

It is an arithmetic number, because the mean of its divisors is an integer number (53908272).

Almost surely, 2^197663653 is an apocalyptic number.

It is an amenable number.

197663653 is a deficient number, since it is larger than the sum of its proper divisors (17969435).

197663653 is a wasteful number, since it uses less digits than its factorization.

197663653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17969434.

The product of its digits is 612360, while the sum is 46.

The square root of 197663653 is about 14059.2906293312. The cubic root of 197663653 is about 582.5174491755.

The spelling of 197663653 in words is "one hundred ninety-seven million, six hundred sixty-three thousand, six hundred fifty-three".