16721161471 has 16 divisors (see below), whose sum is σ = 20043979776. Its totient is φ = 13648347936.

The previous prime is 16721161469. The next prime is 16721161477. The reversal of 16721161471 is 17416112761.

It is a cyclic number.

It is not a de Polignac number, because 16721161471 - 2¹ = 16721161469 is a prime.

It is a super-3 number, since 3×16721161471³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16721161471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721161477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674641 + ... + 698986.

It is an arithmetic number, because the mean of its divisors is an integer number (1252748736).

Almost surely, 2^16721161471 is an apocalyptic number.

16721161471 is a deficient number, since it is larger than the sum of its proper divisors (3322818305).

16721161471 is a wasteful number, since it uses less digits than its factorization.

16721161471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373718.

The product of its digits is 14112, while the sum is 37.

The spelling of 16721161471 in words is "sixteen billion, seven hundred twenty-one million, one hundred sixty-one thousand, four hundred seventy-one".