170390856901 has 2 divisors, whose sum is σ = 170390856902. Its totient is φ = 170390856900.

The previous prime is 170390856893. The next prime is 170390856943. The reversal of 170390856901 is 109658093071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131729073025 + 38661783876 = 362945^2 + 196626^2 .

It is a cyclic number.

It is not a de Polignac number, because 170390856901 - 2³ = 170390856893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170390854901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85195428450 + 85195428451.

It is an arithmetic number, because the mean of its divisors is an integer number (85195428451).

Almost surely, 2^170390856901 is an apocalyptic number.

It is an amenable number.

170390856901 is a deficient number, since it is larger than the sum of its proper divisors (1).

170390856901 is an equidigital number, since it uses as much as digits as its factorization.

170390856901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 170390856901 in words is "one hundred seventy billion, three hundred ninety million, eight hundred fifty-six thousand, nine hundred one".