197005921657 has 2 divisors, whose sum is σ = 197005921658. Its totient is φ = 197005921656.

The previous prime is 197005921631. The next prime is 197005921691. The reversal of 197005921657 is 756129500791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193018756921 + 3987164736 = 439339^2 + 63144^2 .

It is a cyclic number.

It is not a de Polignac number, because 197005921657 - 2³¹ = 194858438009 is a prime.

It is a super-2 number, since 2×197005921657² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (197005021657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98502960828 + 98502960829.

It is an arithmetic number, because the mean of its divisors is an integer number (98502960829).

Almost surely, 2^197005921657 is an apocalyptic number.

It is an amenable number.

197005921657 is a deficient number, since it is larger than the sum of its proper divisors (1).

197005921657 is an equidigital number, since it uses as much as digits as its factorization.

197005921657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1190700, while the sum is 52.

The spelling of 197005921657 in words is "one hundred ninety-seven billion, five million, nine hundred twenty-one thousand, six hundred fifty-seven".