72265631261 has 2 divisors, whose sum is σ = 72265631262. Its totient is φ = 72265631260.

The previous prime is 72265631239. The next prime is 72265631267. The reversal of 72265631261 is 16213656227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70516802500 + 1748828761 = 265550^2 + 41819^2 .

It is a cyclic number.

It is not a de Polignac number, because 72265631261 - 2²⁶ = 72198522397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72265631267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36132815630 + 36132815631.

It is an arithmetic number, because the mean of its divisors is an integer number (36132815631).

Almost surely, 2^72265631261 is an apocalyptic number.

It is an amenable number.

72265631261 is a deficient number, since it is larger than the sum of its proper divisors (1).

72265631261 is an equidigital number, since it uses as much as digits as its factorization.

72265631261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 41.

The spelling of 72265631261 in words is "seventy-two billion, two hundred sixty-five million, six hundred thirty-one thousand, two hundred sixty-one".