1325637707509 has 4 divisors (see below), whose sum is σ = 1403616396204. Its totient is φ = 1247659018816.

The previous prime is 1325637707507. The next prime is 1325637707519. The reversal of 1325637707509 is 9057077365231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 508868222500 + 816769485009 = 713350^2 + 903753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325637707509 - 2¹ = 1325637707507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1325637707509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1325637707507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38989344322 + ... + 38989344355.

It is an arithmetic number, because the mean of its divisors is an integer number (350904099051).

Almost surely, 2^{1325637707509} is an apocalyptic number.

It is an amenable number.

1325637707509 is a deficient number, since it is larger than the sum of its proper divisors (77978688695).

1325637707509 is an equidigital number, since it uses as much as digits as its factorization.

1325637707509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77978688694.

The product of its (nonzero) digits is 8334900, while the sum is 55.

The spelling of 1325637707509 in words is "one trillion, three hundred twenty-five billion, six hundred thirty-seven million, seven hundred seven thousand, five hundred nine".