197455521657 has 8 divisors (see below), whose sum is σ = 266606611840. Its totient is φ = 129970722960.

The previous prime is 197455521629. The next prime is 197455521689. The reversal of 197455521657 is 756125554791.

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

It is not a de Polignac number, because 197455521657 - 2¹⁵ = 197455488889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197455521597 and 197455521606.

It is not an unprimeable number, because it can be changed into a prime (197455591657) 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, 416572594 + ... + 416573067.

It is an arithmetic number, because the mean of its divisors is an integer number (33325826480).

Almost surely, 2^197455521657 is an apocalyptic number.

It is an amenable number.

197455521657 is a deficient number, since it is larger than the sum of its proper divisors (69151090183).

197455521657 is an equidigital number, since it uses as much as digits as its factorization.

197455521657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833145743.

The product of its digits is 13230000, while the sum is 57.

The spelling of 197455521657 in words is "one hundred ninety-seven billion, four hundred fifty-five million, five hundred twenty-one thousand, six hundred fifty-seven".