170978205949 has 16 divisors (see below), whose sum is σ = 176038246720. Its totient is φ = 166000181760.

The previous prime is 170978205911. The next prime is 170978205953. The reversal of 170978205949 is 949502879071.

It is not a de Polignac number, because 170978205949 - 2¹⁷ = 170978074877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170978205149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2204422 + ... + 2280664.

It is an arithmetic number, because the mean of its divisors is an integer number (11002390420).

Almost surely, 2^170978205949 is an apocalyptic number.

It is an amenable number.

170978205949 is a deficient number, since it is larger than the sum of its proper divisors (5060040771).

170978205949 is an equidigital number, since it uses as much as digits as its factorization.

170978205949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76780.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 170978205949 in words is "one hundred seventy billion, nine hundred seventy-eight million, two hundred five thousand, nine hundred forty-nine".