72163921853 has 2 divisors, whose sum is σ = 72163921854. Its totient is φ = 72163921852.

The previous prime is 72163921847. The next prime is 72163921859. The reversal of 72163921853 is 35812936127.

It is a balanced prime because it is at equal distance from previous prime (72163921847) and next prime (72163921859).

It can be written as a sum of positive squares in only one way, i.e., 70946051449 + 1217870404 = 266357^2 + 34898^2 .

It is a cyclic number.

It is not a de Polignac number, because 72163921853 - 2⁶ = 72163921789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72163921798 and 72163921807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72163921859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36081960926 + 36081960927.

It is an arithmetic number, because the mean of its divisors is an integer number (36081960927).

Almost surely, 2^72163921853 is an apocalyptic number.

It is an amenable number.

72163921853 is a deficient number, since it is larger than the sum of its proper divisors (1).

72163921853 is an equidigital number, since it uses as much as digits as its factorization.

72163921853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The spelling of 72163921853 in words is "seventy-two billion, one hundred sixty-three million, nine hundred twenty-one thousand, eight hundred fifty-three".