71647123169 has 18 divisors (see below), whose sum is σ = 77997624054. Its totient is φ = 65761135360.

The previous prime is 71647123147. The next prime is 71647123241. The reversal of 71647123169 is 96132174617.

It can be written as a sum of positive squares in 3 ways, for example, as 11180313169 + 60466810000 = 105737^2 + 245900^2 .

It is not a de Polignac number, because 71647123169 - 2¹² = 71647119073 is a prime.

It is a super-2 number, since 2×71647123169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71647123129) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29135462 + ... + 29137920.

Almost surely, 2^71647123169 is an apocalyptic number.

It is an amenable number.

71647123169 is a deficient number, since it is larger than the sum of its proper divisors (6350500885).

71647123169 is an frugal number, since it uses more digits than its factorization.

71647123169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993 (or 2517 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The spelling of 71647123169 in words is "seventy-one billion, six hundred forty-seven million, one hundred twenty-three thousand, one hundred sixty-nine".