15690819169 has 9 divisors (see below), whose sum is σ = 15788500947. Its totient is φ = 15593740344.

The previous prime is 15690819161. The next prime is 15690819173. The reversal of 15690819169 is 96191809651.

The square root of 15690819169 is 125263.

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., 14613666769 + 1077152400 = 120887^2 + 32820^2 .

It is not a de Polignac number, because 15690819169 - 2³ = 15690819161 is a prime.

It is a super-2 number, since 2×15690819169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15690819161) 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, 28684954 + ... + 28685500.

It is an arithmetic number, because the mean of its divisors is an integer number (1754277883).

Almost surely, 2^15690819169 is an apocalyptic number.

15690819169 is the 125263-rd square number.

15690819169 is the 62632-nd centered octagonal number.

It is an amenable number.

15690819169 is a deficient number, since it is larger than the sum of its proper divisors (97681778).

15690819169 is an frugal number, since it uses more digits than its factorization.

15690819169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 55.

The spelling of 15690819169 in words is "fifteen billion, six hundred ninety million, eight hundred nineteen thousand, one hundred sixty-nine".