71988476381 has 2 divisors, whose sum is σ = 71988476382. Its totient is φ = 71988476380.

The previous prime is 71988476341. The next prime is 71988476387. The reversal of 71988476381 is 18367488917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61078673881 + 10909802500 = 247141^2 + 104450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71988476381 is a prime.

It is a super-2 number, since 2×71988476381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71988476387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35994238190 + 35994238191.

It is an arithmetic number, because the mean of its divisors is an integer number (35994238191).

Almost surely, 2^71988476381 is an apocalyptic number.

It is an amenable number.

71988476381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71988476381 is an equidigital number, since it uses as much as digits as its factorization.

71988476381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 62.

The spelling of 71988476381 in words is "seventy-one billion, nine hundred eighty-eight million, four hundred seventy-six thousand, three hundred eighty-one".