71771210787 has 18 divisors (see below), whose sum is σ = 96484009188. Its totient is φ = 47456151168.

The previous prime is 71771210737. The next prime is 71771210801. The reversal of 71771210787 is 78701217717.

It is not a de Polignac number, because 71771210787 - 2⁷ = 71771210659 is a prime.

It is a super-2 number, since 2×71771210787² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71771210737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63570039 + ... + 63571167.

Almost surely, 2^71771210787 is an apocalyptic number.

71771210787 is a deficient number, since it is larger than the sum of its proper divisors (24712798401).

71771210787 is an frugal number, since it uses more digits than its factorization.

71771210787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 268912, while the sum is 48.

Multiplying 71771210787 by its sum of digits (48), we get a square (3445018117776 = 1856076²).

The spelling of 71771210787 in words is "seventy-one billion, seven hundred seventy-one million, two hundred ten thousand, seven hundred eighty-seven".