197306508457 has 4 divisors (see below), whose sum is σ = 198092590416. Its totient is φ = 196520426500.

The previous prime is 197306508439. The next prime is 197306508461. The reversal of 197306508457 is 754805603791.

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: 754805603791 = 398609 ⋅1893599.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197306508457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197306508398 and 197306508407.

It is not an unprimeable number, because it can be changed into a prime (197306508437) 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, 393040603 + ... + 393041104.

It is an arithmetic number, because the mean of its divisors is an integer number (49523147604).

Almost surely, 2^197306508457 is an apocalyptic number.

It is an amenable number.

197306508457 is a deficient number, since it is larger than the sum of its proper divisors (786081959).

197306508457 is an equidigital number, since it uses as much as digits as its factorization.

197306508457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786081958.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 197306508457 in words is "one hundred ninety-seven billion, three hundred six million, five hundred eight thousand, four hundred fifty-seven".