71261697387 has 18 divisors (see below), whose sum is σ = 99341147836. Its totient is φ = 45435460400.

The previous prime is 71261697379. The next prime is 71261697389. The reversal of 71261697387 is 78379616217.

It is a happy number.

It is not a de Polignac number, because 71261697387 - 2³ = 71261697379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71261697389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10631137 + ... + 10637837.

Almost surely, 2^71261697387 is an apocalyptic number.

71261697387 is a deficient number, since it is larger than the sum of its proper divisors (28079450449).

71261697387 is an frugal number, since it uses more digits than its factorization.

71261697387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13451 (or 6727 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 57.

The spelling of 71261697387 in words is "seventy-one billion, two hundred sixty-one million, six hundred ninety-seven thousand, three hundred eighty-seven".