16695482521 has 9 divisors (see below), whose sum is σ = 16822941471. Its totient is φ = 16568984952.

The previous prime is 16695482471. The next prime is 16695482537. The reversal of 16695482521 is 12528459661.

It is a happy number.

The square root of 16695482521 is 129211.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4893702025 + 11801780496 = 69955^2 + 108636^2 .

It is not a de Polignac number, because 16695482521 - 2¹³ = 16695474329 is a prime.

It is a super-3 number, since 3×16695482521³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16695489521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20285716 + ... + 20286538.

It is an arithmetic number, because the mean of its divisors is an integer number (1869215719).

Almost surely, 2^16695482521 is an apocalyptic number.

16695482521 is the 129211-st square number.

16695482521 is the 64606-th centered octagonal number.

It is an amenable number.

16695482521 is a deficient number, since it is larger than the sum of its proper divisors (127458950).

16695482521 is an frugal number, since it uses more digits than its factorization.

16695482521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960 (or 980 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 49.

Multiplying 16695482521 by its sum of digits (49), we get a square (818078643529 = 904477²).

The spelling of 16695482521 in words is "sixteen billion, six hundred ninety-five million, four hundred eighty-two thousand, five hundred twenty-one".