86615420197 has 2 divisors, whose sum is σ = 86615420198. Its totient is φ = 86615420196.

The previous prime is 86615420167. The next prime is 86615420201. The reversal of 86615420197 is 79102451668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67376065761 + 19239354436 = 259569^2 + 138706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86615420197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86615420197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86615420147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43307710098 + 43307710099.

It is an arithmetic number, because the mean of its divisors is an integer number (43307710099).

Almost surely, 2^86615420197 is an apocalyptic number.

It is an amenable number.

86615420197 is a deficient number, since it is larger than the sum of its proper divisors (1).

86615420197 is an equidigital number, since it uses as much as digits as its factorization.

86615420197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 86615420197 in words is "eighty-six billion, six hundred fifteen million, four hundred twenty thousand, one hundred ninety-seven".