71721448507 has 2 divisors, whose sum is σ = 71721448508. Its totient is φ = 71721448506.

The previous prime is 71721448493. The next prime is 71721448517. The reversal of 71721448507 is 70584412717.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71721448507 is a prime.

It is a super-3 number, since 3×71721448507³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (71721448517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35860724253 + 35860724254.

It is an arithmetic number, because the mean of its divisors is an integer number (35860724254).

Almost surely, 2^71721448507 is an apocalyptic number.

71721448507 is a deficient number, since it is larger than the sum of its proper divisors (1).

71721448507 is an equidigital number, since it uses as much as digits as its factorization.

71721448507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 71721448507 in words is "seventy-one billion, seven hundred twenty-one million, four hundred forty-eight thousand, five hundred seven".