1347435745681 has 9 divisors (see below), whose sum is σ = 1357953282619. Its totient is φ = 1336999073800.

The previous prime is 1347435745657. The next prime is 1347435745697. The reversal of 1347435745681 is 1865475347431.

The square root of 1347435745681 is 1160791.

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., 1332272286081 + 15163459600 = 1154241^2 + 123140^2 .

It is not a de Polignac number, because 1347435745681 - 2¹³ = 1347435737489 is a prime.

It is a super-2 number, since 2×1347435745681² (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 (1347435745081) 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, 152059191 + ... + 152068051.

Almost surely, 2^{1347435745681} is an apocalyptic number.

1347435745681 is the 1160791-st square number.

1347435745681 is the 580396-th centered octagonal number.

It is an amenable number.

1347435745681 is a deficient number, since it is larger than the sum of its proper divisors (10517536938).

1347435745681 is an frugal number, since it uses more digits than its factorization.

1347435745681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17984 (or 8992 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 58.

The spelling of 1347435745681 in words is "one trillion, three hundred forty-seven billion, four hundred thirty-five million, seven hundred forty-five thousand, six hundred eighty-one".