1269355995649 has 15 divisors (see below), whose sum is σ = 1480891621443. Its totient is φ = 1087972105248.

The previous prime is 1269355995641. The next prime is 1269355995671. The reversal of 1269355995649 is 9465995539621.

The square root of 1269355995649 is 1126657.

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., 1040267404225 + 229088591424 = 1019935^2 + 478632^2 .

It is not a de Polignac number, because 1269355995649 - 2³ = 1269355995641 is a prime.

It is a super-3 number, since 3×1269355995649³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1269355995641) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 55194697 + ... + 55217689.

Almost surely, 2^{1269355995649} is an apocalyptic number.

1269355995649 is the 1126657-th square number.

1269355995649 is the 563329-th centered octagonal number.

It is an amenable number.

1269355995649 is a deficient number, since it is larger than the sum of its proper divisors (211535625794).

1269355995649 is an frugal number, since it uses more digits than its factorization.

1269355995649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46014 (or 23000 counting only the distinct ones).

The product of its digits is 708588000, while the sum is 73.

The spelling of 1269355995649 in words is "one trillion, two hundred sixty-nine billion, three hundred fifty-five million, nine hundred ninety-five thousand, six hundred forty-nine".