38445138865 has 16 divisors (see below), whose sum is σ = 52745552640. Its totient is φ = 26351985600.

The previous prime is 38445138863. The next prime is 38445138877. The reversal of 38445138865 is 56883154483.

It is a happy number.

It is not a de Polignac number, because 38445138865 - 2¹ = 38445138863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38445138863) 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, 126010 + ... + 304579.

It is an arithmetic number, because the mean of its divisors is an integer number (3296597040).

Almost surely, 2^38445138865 is an apocalyptic number.

38445138865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

38445138865 is a deficient number, since it is larger than the sum of its proper divisors (14300413775).

38445138865 is a wasteful number, since it uses less digits than its factorization.

38445138865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433152.

The product of its digits is 11059200, while the sum is 55.

It can be divided in two parts, 38445 and 138865, that added together give a triangular number (177310 = T₅₉₅).

The spelling of 38445138865 in words is "thirty-eight billion, four hundred forty-five million, one hundred thirty-eight thousand, eight hundred sixty-five".