1611216419569 has 3 divisors (see below), whose sum is σ = 1611217688907. Its totient is φ = 1611215150232.

The previous prime is 1611216419557. The next prime is 1611216419623. The reversal of 1611216419569 is 9659146121161.

It is a happy number.

The square root of 1611216419569 is 1269337.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1283904279025 + 327312140544 = 1133095^2 + 572112^2 .

It is not a de Polignac number, because 1611216419569 - 2¹⁹ = 1611215895281 is a prime.

It is a super-2 number, since 2×1611216419569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1611216419069) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 634669 + ... + 1904005.

It is an arithmetic number, because the mean of its divisors is an integer number (537072562969).

Almost surely, 2^{1611216419569} is an apocalyptic number.

1611216419569 is the 1269337-th square number.

1611216419569 is the 634669-th centered octagonal number.

It is an amenable number.

1611216419569 is a deficient number, since it is larger than the sum of its proper divisors (1269338).

1611216419569 is an frugal number, since it uses more digits than its factorization.

1611216419569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538674 (or 1269337 counting only the distinct ones).

The product of its digits is 699840, while the sum is 52.

The spelling of 1611216419569 in words is "one trillion, six hundred eleven billion, two hundred sixteen million, four hundred nineteen thousand, five hundred sixty-nine".