1245662321138 has 4 divisors (see below), whose sum is σ = 1868493481710. Its totient is φ = 622831160568.

The previous prime is 1245662321131. The next prime is 1245662321171. The reversal of 1245662321138 is 8311232665421.

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

It can be written as a sum of positive squares in only one way, i.e., 1090735850689 + 154926470449 = 1044383^2 + 393607^2 .

It is not an unprimeable number, because it can be changed into a prime (1245662321131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311415580283 + ... + 311415580286.

Almost surely, 2^{1245662321138} is an apocalyptic number.

1245662321138 is a deficient number, since it is larger than the sum of its proper divisors (622831160572).

1245662321138 is an equidigital number, since it uses as much as digits as its factorization.

1245662321138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622831160571.

The product of its digits is 414720, while the sum is 44.

Adding to 1245662321138 its reverse (8311232665421), we get a palindrome (9556894986559).

The spelling of 1245662321138 in words is "one trillion, two hundred forty-five billion, six hundred sixty-two million, three hundred twenty-one thousand, one hundred thirty-eight".