72917276381 has 2 divisors, whose sum is σ = 72917276382. Its totient is φ = 72917276380.

The previous prime is 72917276371. The next prime is 72917276413. The reversal of 72917276381 is 18367271927.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46411808356 + 26505468025 = 215434^2 + 162805^2 .

It is a cyclic number.

It is not a de Polignac number, because 72917276381 - 2¹⁸ = 72917014237 is a prime.

It is a super-2 number, since 2×72917276381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72917276371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36458638190 + 36458638191.

It is an arithmetic number, because the mean of its divisors is an integer number (36458638191).

Almost surely, 2^72917276381 is an apocalyptic number.

It is an amenable number.

72917276381 is a deficient number, since it is larger than the sum of its proper divisors (1).

72917276381 is an equidigital number, since it uses as much as digits as its factorization.

72917276381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The spelling of 72917276381 in words is "seventy-two billion, nine hundred seventeen million, two hundred seventy-six thousand, three hundred eighty-one".