170315967978 has 128 divisors (see below), whose sum is σ = 428669337600. Its totient is φ = 49731143616.

The previous prime is 170315967971. The next prime is 170315968037. The reversal of 170315967978 is 879769513071.

170315967978 is a `hidden beast` number, since 1 + 7 + 0 + 31 + 596 + 7 + 9 + 7 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (170315967971) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2009013 + ... + 2092071.

It is an arithmetic number, because the mean of its divisors is an integer number (3348979200).

Almost surely, 2^170315967978 is an apocalyptic number.

170315967978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 170315967978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214334668800).

170315967978 is an abundant number, since it is smaller than the sum of its proper divisors (258353369622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

170315967978 is a wasteful number, since it uses less digits than its factorization.

170315967978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83233 (or 83227 counting only the distinct ones).

The product of its (nonzero) digits is 20003760, while the sum is 63.

The spelling of 170315967978 in words is "one hundred seventy billion, three hundred fifteen million, nine hundred sixty-seven thousand, nine hundred seventy-eight".