199771354957 has 2 divisors, whose sum is σ = 199771354958. Its totient is φ = 199771354956.

The previous prime is 199771354921. The next prime is 199771354999. The reversal of 199771354957 is 759453177991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199684753321 + 86601636 = 446861^2 + 9306^2 .

It is a cyclic number.

It is not a de Polignac number, because 199771354957 - 2³⁵ = 165411616589 is a prime.

It is a super-2 number, since 2×199771354957² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199771354892 and 199771354901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199771054957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99885677478 + 99885677479.

It is an arithmetic number, because the mean of its divisors is an integer number (99885677479).

Almost surely, 2^199771354957 is an apocalyptic number.

It is an amenable number.

199771354957 is a deficient number, since it is larger than the sum of its proper divisors (1).

199771354957 is an equidigital number, since it uses as much as digits as its factorization.

199771354957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75014100, while the sum is 67.

The spelling of 199771354957 in words is "one hundred ninety-nine billion, seven hundred seventy-one million, three hundred fifty-four thousand, nine hundred fifty-seven".