72156032209 has 2 divisors, whose sum is σ = 72156032210. Its totient is φ = 72156032208.

The previous prime is 72156032197. The next prime is 72156032213. The reversal of 72156032209 is 90223065127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64923040000 + 7232992209 = 254800^2 + 85047^2 .

It is a cyclic number.

It is not a de Polignac number, because 72156032209 - 2⁹ = 72156031697 is a prime.

It is not a weakly prime, because it can be changed into another prime (72156032269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36078016104 + 36078016105.

It is an arithmetic number, because the mean of its divisors is an integer number (36078016105).

Almost surely, 2^72156032209 is an apocalyptic number.

It is an amenable number.

72156032209 is a deficient number, since it is larger than the sum of its proper divisors (1).

72156032209 is an equidigital number, since it uses as much as digits as its factorization.

72156032209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 72156032209 in words is "seventy-two billion, one hundred fifty-six million, thirty-two thousand, two hundred nine".