85420134197 has 2 divisors, whose sum is σ = 85420134198. Its totient is φ = 85420134196.

The previous prime is 85420134119. The next prime is 85420134227. The reversal of 85420134197 is 79143102458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83123232721 + 2296901476 = 288311^2 + 47926^2 .

It is a cyclic number.

It is not a de Polignac number, because 85420134197 - 2²² = 85415939893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85420634197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42710067098 + 42710067099.

It is an arithmetic number, because the mean of its divisors is an integer number (42710067099).

Almost surely, 2^85420134197 is an apocalyptic number.

It is an amenable number.

85420134197 is a deficient number, since it is larger than the sum of its proper divisors (1).

85420134197 is an equidigital number, since it uses as much as digits as its factorization.

85420134197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 85420134197 in words is "eighty-five billion, four hundred twenty million, one hundred thirty-four thousand, one hundred ninety-seven".