71435779381 has 2 divisors, whose sum is σ = 71435779382. Its totient is φ = 71435779380.

The previous prime is 71435779361. The next prime is 71435779399. The reversal of 71435779381 is 18397753417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62033374225 + 9402405156 = 249065^2 + 96966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71435779381 is a prime.

It is a super-2 number, since 2×71435779381² (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 (71435779361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35717889690 + 35717889691.

It is an arithmetic number, because the mean of its divisors is an integer number (35717889691).

Almost surely, 2^71435779381 is an apocalyptic number.

It is an amenable number.

71435779381 is a deficient number, since it is larger than the sum of its proper divisors (1).

71435779381 is an equidigital number, since it uses as much as digits as its factorization.

71435779381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The spelling of 71435779381 in words is "seventy-one billion, four hundred thirty-five million, seven hundred seventy-nine thousand, three hundred eighty-one".