1286720429569 has 27 divisors (see below), whose sum is σ = 1358288798979. Its totient is φ = 1218822419760.

The previous prime is 1286720429567. The next prime is 1286720429597. The reversal of 1286720429569 is 9659240276821.

The square root of 1286720429569 is 1134337.

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., 150748157169 + 1135972272400 = 388263^2 + 1065820^2 .

It is not a de Polignac number, because 1286720429569 - 2¹ = 1286720429567 is a prime.

It is a super-2 number, since 2×1286720429569² (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 (1286720429567) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3887372734 + ... + 3887373064.

Almost surely, 2^{1286720429569} is an apocalyptic number.

1286720429569 is the 1134337-th square number.

1286720429569 is the 567169-th centered octagonal number.

It is an amenable number.

1286720429569 is a deficient number, since it is larger than the sum of its proper divisors (71568369410).

1286720429569 is an frugal number, since it uses more digits than its factorization.

1286720429569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 1286720429569 in words is "one trillion, two hundred eighty-six billion, seven hundred twenty million, four hundred twenty-nine thousand, five hundred sixty-nine".