171622580825921 has 2 divisors, whose sum is σ = 171622580825922. Its totient is φ = 171622580825920.

The previous prime is 171622580825849. The next prime is 171622580825959. The reversal of 171622580825921 is 129528085226171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147380546921521 + 24242033904400 = 12140039^2 + 4923620^2 .

It is a cyclic number.

It is not a de Polignac number, because 171622580825921 - 2⁴⁶ = 101253836648257 is a prime.

It is not a weakly prime, because it can be changed into another prime (171622580821921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85811290412960 + 85811290412961.

It is an arithmetic number, because the mean of its divisors is an integer number (85811290412961).

Almost surely, 2^{171622580825921} is an apocalyptic number.

It is an amenable number.

171622580825921 is a deficient number, since it is larger than the sum of its proper divisors (1).

171622580825921 is an equidigital number, since it uses as much as digits as its factorization.

171622580825921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9676800, while the sum is 59.

The spelling of 171622580825921 in words is "one hundred seventy-one trillion, six hundred twenty-two billion, five hundred eighty million, eight hundred twenty-five thousand, nine hundred twenty-one".