72168390170 has 16 divisors (see below), whose sum is σ = 129924095688. Its totient is φ = 28862690880.

The previous prime is 72168390169. The next prime is 72168390187. The reversal of 72168390170 is 7109386127.

It can be written as a sum of positive squares in 4 ways, for example, as 12923369761 + 59245020409 = 113681^2 + 243403^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 517829 + ... + 642248.

Almost surely, 2^72168390170 is an apocalyptic number.

72168390170 is a deficient number, since it is larger than the sum of its proper divisors (57755705518).

72168390170 is a wasteful number, since it uses less digits than its factorization.

72168390170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166305.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 72168390170 in words is "seventy-two billion, one hundred sixty-eight million, three hundred ninety thousand, one hundred seventy".