72168503851 has 16 divisors (see below), whose sum is σ = 77534791488. Its totient is φ = 67005030400.

The previous prime is 72168503801. The next prime is 72168503867. The reversal of 72168503851 is 15830586127.

It is a cyclic number.

It is not a de Polignac number, because 72168503851 - 2¹¹ = 72168501803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72168503801) 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, 8470 + ... + 380011.

It is an arithmetic number, because the mean of its divisors is an integer number (4845924468).

Almost surely, 2^72168503851 is an apocalyptic number.

72168503851 is a deficient number, since it is larger than the sum of its proper divisors (5366287637).

72168503851 is a wasteful number, since it uses less digits than its factorization.

72168503851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388742.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 72168503851 in words is "seventy-two billion, one hundred sixty-eight million, five hundred three thousand, eight hundred fifty-one".