378861665534 has 16 divisors (see below), whose sum is σ = 619967971440. Its totient is φ = 172206370560.

The previous prime is 378861665531. The next prime is 378861665579. The reversal of 378861665534 is 435566168873.

It is a super-2 number, since 2×378861665534² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1171832 + ... + 1459764.

It is an arithmetic number, because the mean of its divisors is an integer number (38747998215).

Almost surely, 2^378861665534 is an apocalyptic number.

378861665534 is a deficient number, since it is larger than the sum of its proper divisors (241106305906).

378861665534 is a wasteful number, since it uses less digits than its factorization.

378861665534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347755.

The product of its digits is 87091200, while the sum is 62.

The spelling of 378861665534 in words is "three hundred seventy-eight billion, eight hundred sixty-one million, six hundred sixty-five thousand, five hundred thirty-four".