7215864435749 has 2 divisors, whose sum is σ = 7215864435750. Its totient is φ = 7215864435748.

The previous prime is 7215864435691. The next prime is 7215864435809. The reversal of 7215864435749 is 9475344685127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7192212148900 + 23652286849 = 2681830^2 + 153793^2 .

It is a cyclic number.

It is not a de Polignac number, because 7215864435749 - 2¹⁶ = 7215864370213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7215864435049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607932217874 + 3607932217875.

It is an arithmetic number, because the mean of its divisors is an integer number (3607932217875).

Almost surely, 2^{7215864435749} is an apocalyptic number.

It is an amenable number.

7215864435749 is a deficient number, since it is larger than the sum of its proper divisors (1).

7215864435749 is an equidigital number, since it uses as much as digits as its factorization.

7215864435749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 203212800, while the sum is 65.

The spelling of 7215864435749 in words is "seven trillion, two hundred fifteen billion, eight hundred sixty-four million, four hundred thirty-five thousand, seven hundred forty-nine".