72168503881 has 2 divisors, whose sum is σ = 72168503882. Its totient is φ = 72168503880.

The previous prime is 72168503867. The next prime is 72168503903. The reversal of 72168503881 is 18830586127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39465398281 + 32703105600 = 198659^2 + 180840^2 .

It is a cyclic number.

It is not a de Polignac number, because 72168503881 - 2⁷ = 72168503753 is a prime.

It is a super-2 number, since 2×72168503881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72168503801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084251940 + 36084251941.

It is an arithmetic number, because the mean of its divisors is an integer number (36084251941).

Almost surely, 2^72168503881 is an apocalyptic number.

It is an amenable number.

72168503881 is a deficient number, since it is larger than the sum of its proper divisors (1).

72168503881 is an equidigital number, since it uses as much as digits as its factorization.

72168503881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 72168503881 in words is "seventy-two billion, one hundred sixty-eight million, five hundred three thousand, eight hundred eighty-one".