7638138256445 has 16 divisors (see below), whose sum is σ = 9648946333440. Its totient is φ = 5788441767744.

The previous prime is 7638138256423. The next prime is 7638138256447. The reversal of 7638138256445 is 5446528318367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7638138256445 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7638138256447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2019062 + ... + 4399191.

It is an arithmetic number, because the mean of its divisors is an integer number (603059145840).

Almost surely, 2^{7638138256445} is an apocalyptic number.

It is an amenable number.

7638138256445 is a deficient number, since it is larger than the sum of its proper divisors (2010808076995).

7638138256445 is a wasteful number, since it uses less digits than its factorization.

7638138256445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430804.

The product of its digits is 116121600, while the sum is 62.

The spelling of 7638138256445 in words is "seven trillion, six hundred thirty-eight billion, one hundred thirty-eight million, two hundred fifty-six thousand, four hundred forty-five".