72775723771 has 2 divisors, whose sum is σ = 72775723772. Its totient is φ = 72775723770.

The previous prime is 72775723717. The next prime is 72775723817. The reversal of 72775723771 is 17732757727.

Together with previous prime (72775723717) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72775723771 - 2²¹ = 72773626619 is a prime.

It is not a weakly prime, because it can be changed into another prime (72775723571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36387861885 + 36387861886.

It is an arithmetic number, because the mean of its divisors is an integer number (36387861886).

Almost surely, 2^72775723771 is an apocalyptic number.

72775723771 is a deficient number, since it is larger than the sum of its proper divisors (1).

72775723771 is an equidigital number, since it uses as much as digits as its factorization.

72775723771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7058940, while the sum is 55.

The spelling of 72775723771 in words is "seventy-two billion, seven hundred seventy-five million, seven hundred twenty-three thousand, seven hundred seventy-one".