378861665538 has 16 divisors (see below), whose sum is σ = 778202340480. Its totient is φ = 122874053616.

The previous prime is 378861665531. The next prime is 378861665579. The reversal of 378861665538 is 835566168873.

It is a super-2 number, since 2×378861665538² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (378861665531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853291818 + ... + 853292261.

It is an arithmetic number, because the mean of its divisors is an integer number (48637646280).

Almost surely, 2^378861665538 is an apocalyptic number.

378861665538 is an abundant number, since it is smaller than the sum of its proper divisors (399340674942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

378861665538 is a wasteful number, since it uses less digits than its factorization.

378861665538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706584121.

The product of its digits is 174182400, while the sum is 66.

The spelling of 378861665538 in words is "three hundred seventy-eight billion, eight hundred sixty-one million, six hundred sixty-five thousand, five hundred thirty-eight".