72168503856 has 40 divisors (see below), whose sum is σ = 186969543600. Its totient is φ = 23987233536.

The previous prime is 72168503801. The next prime is 72168503867. The reversal of 72168503856 is 65830586127.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 72168503799 and 72168503808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2137275 + ... + 2170778.

It is an arithmetic number, because the mean of its divisors is an integer number (4674238590).

Almost surely, 2^72168503856 is an apocalyptic number.

It is an amenable number.

72168503856 is an abundant number, since it is smaller than the sum of its proper divisors (114801039744).

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

72168503856 is a wasteful number, since it uses less digits than its factorization.

72168503856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308413 (or 4308407 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 72168503856 in words is "seventy-two billion, one hundred sixty-eight million, five hundred three thousand, eight hundred fifty-six".