1245708228769 has 9 divisors (see below), whose sum is σ = 1253869591737. Its totient is φ = 1237599667824.

The previous prime is 1245708228703. The next prime is 1245708228827. The reversal of 1245708228769 is 9678228075421.

It is a happy number.

The square root of 1245708228769 is 1116113.

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

It can be written as a sum of positive squares in 4 ways, for example, as 409376030625 + 836332198144 = 639825^2 + 914512^2 .

It is not a de Polignac number, because 1245708228769 - 2¹³ = 1245708220577 is a prime.

It is a super-2 number, since 2×1245708228769² (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 (1245708228269) 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, 175226187 + ... + 175233295.

Almost surely, 2^{1245708228769} is an apocalyptic number.

1245708228769 is the 1116113-rd square number.

1245708228769 is the 558057-th centered octagonal number.

It is an amenable number.

1245708228769 is a deficient number, since it is larger than the sum of its proper divisors (8161362968).

1245708228769 is an frugal number, since it uses more digits than its factorization.

1245708228769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14532 (or 7266 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 1245708228769 in words is "one trillion, two hundred forty-five billion, seven hundred eight million, two hundred twenty-eight thousand, seven hundred sixty-nine".