71520561799 has 2 divisors, whose sum is σ = 71520561800. Its totient is φ = 71520561798.

The previous prime is 71520561781. The next prime is 71520561811. The reversal of 71520561799 is 99716502517.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71520561799 - 2¹¹ = 71520559751 is a prime.

It is a super-4 number, since 4×71520561799⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71520561709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35760280899 + 35760280900.

It is an arithmetic number, because the mean of its divisors is an integer number (35760280900).

Almost surely, 2^71520561799 is an apocalyptic number.

71520561799 is a deficient number, since it is larger than the sum of its proper divisors (1).

71520561799 is an equidigital number, since it uses as much as digits as its factorization.

71520561799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1190700, while the sum is 52.

The spelling of 71520561799 in words is "seventy-one billion, five hundred twenty million, five hundred sixty-one thousand, seven hundred ninety-nine".