71219156609 has 2 divisors, whose sum is σ = 71219156610. Its totient is φ = 71219156608.

The previous prime is 71219156581. The next prime is 71219156621. The reversal of 71219156609 is 90665191217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49506250000 + 21712906609 = 222500^2 + 147353^2 .

It is a cyclic number.

It is not a de Polignac number, because 71219156609 - 2¹² = 71219152513 is a prime.

It is not a weakly prime, because it can be changed into another prime (71219156639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35609578304 + 35609578305.

It is an arithmetic number, because the mean of its divisors is an integer number (35609578305).

Almost surely, 2^71219156609 is an apocalyptic number.

It is an amenable number.

71219156609 is a deficient number, since it is larger than the sum of its proper divisors (1).

71219156609 is an equidigital number, since it uses as much as digits as its factorization.

71219156609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 71219156609 in words is "seventy-one billion, two hundred nineteen million, one hundred fifty-six thousand, six hundred nine".