171864288977 has 2 divisors, whose sum is σ = 171864288978. Its totient is φ = 171864288976.

The previous prime is 171864288919. The next prime is 171864288989. The reversal of 171864288977 is 779882468171.

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., 138241932481 + 33622356496 = 371809^2 + 183364^2 .

It is a cyclic number.

It is not a de Polignac number, because 171864288977 - 2⁶ = 171864288913 is a prime.

It is not a weakly prime, because it can be changed into another prime (171864288377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85932144488 + 85932144489.

It is an arithmetic number, because the mean of its divisors is an integer number (85932144489).

Almost surely, 2^171864288977 is an apocalyptic number.

It is an amenable number.

171864288977 is a deficient number, since it is larger than the sum of its proper divisors (1).

171864288977 is an equidigital number, since it uses as much as digits as its factorization.

171864288977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75866112, while the sum is 68.

The spelling of 171864288977 in words is "one hundred seventy-one billion, eight hundred sixty-four million, two hundred eighty-eight thousand, nine hundred seventy-seven".