197643036505 has 8 divisors (see below), whose sum is σ = 237177175752. Its totient is φ = 158110741248.

The previous prime is 197643036457. The next prime is 197643036529. The reversal of 197643036505 is 505630346791.

It can be written as a sum of positive squares in 4 ways, for example, as 42648858256 + 154994178249 = 206516^2 + 393693^2 .

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 197643036505 - 2²³ = 197634647897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213072 + ... + 663841.

It is an arithmetic number, because the mean of its divisors is an integer number (29647146969).

Almost surely, 2^197643036505 is an apocalyptic number.

It is an amenable number.

197643036505 is a deficient number, since it is larger than the sum of its proper divisors (39534139247).

197643036505 is an equidigital number, since it uses as much as digits as its factorization.

197643036505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921995.

The product of its (nonzero) digits is 2041200, while the sum is 49.

The spelling of 197643036505 in words is "one hundred ninety-seven billion, six hundred forty-three million, thirty-six thousand, five hundred five".