40372207217 has 2 divisors, whose sum is σ = 40372207218. Its totient is φ = 40372207216.

The previous prime is 40372207199. The next prime is 40372207259. The reversal of 40372207217 is 71270227304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35195260816 + 5176946401 = 187604^2 + 71951^2 .

It is a cyclic number.

It is not a de Polignac number, because 40372207217 - 2⁸ = 40372206961 is a prime.

It is not a weakly prime, because it can be changed into another prime (40372207297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20186103608 + 20186103609.

It is an arithmetic number, because the mean of its divisors is an integer number (20186103609).

Almost surely, 2^40372207217 is an apocalyptic number.

It is an amenable number.

40372207217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40372207217 is an equidigital number, since it uses as much as digits as its factorization.

40372207217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 35.

The spelling of 40372207217 in words is "forty billion, three hundred seventy-two million, two hundred seven thousand, two hundred seventeen".