161217711447 has 32 divisors (see below), whose sum is σ = 253016064000. Its totient is φ = 90362856960.

The previous prime is 161217711439. The next prime is 161217711463. The reversal of 161217711447 is 744117712161.

It is not a de Polignac number, because 161217711447 - 2³ = 161217711439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161217711399 and 161217711408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161217711407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3901447 + ... + 3942552.

It is an arithmetic number, because the mean of its divisors is an integer number (7906752000).

Almost surely, 2^161217711447 is an apocalyptic number.

161217711447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161217711447 is a deficient number, since it is larger than the sum of its proper divisors (91798352553).

161217711447 is a wasteful number, since it uses less digits than its factorization.

161217711447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844063.

The product of its digits is 65856, while the sum is 42.

The spelling of 161217711447 in words is "one hundred sixty-one billion, two hundred seventeen million, seven hundred eleven thousand, four hundred forty-seven".