72515170861009 has 2 divisors, whose sum is σ = 72515170861010. Its totient is φ = 72515170861008.

The previous prime is 72515170860989. The next prime is 72515170861127. The reversal of 72515170861009 is 90016807151527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70692832857409 + 1822338003600 = 8407903^2 + 1349940^2 .

It is a cyclic number.

It is not a de Polignac number, because 72515170861009 - 2⁹ = 72515170860497 is a prime.

It is not a weakly prime, because it can be changed into another prime (72515170861709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36257585430504 + 36257585430505.

It is an arithmetic number, because the mean of its divisors is an integer number (36257585430505).

Almost surely, 2^{72515170861009} is an apocalyptic number.

It is an amenable number.

72515170861009 is a deficient number, since it is larger than the sum of its proper divisors (1).

72515170861009 is an equidigital number, since it uses as much as digits as its factorization.

72515170861009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058400, while the sum is 52.

The spelling of 72515170861009 in words is "seventy-two trillion, five hundred fifteen billion, one hundred seventy million, eight hundred sixty-one thousand, nine".