378834551681 has 16 divisors (see below), whose sum is σ = 411669433728. Its totient is φ = 347292960000.

The previous prime is 378834551677. The next prime is 378834551759. The reversal of 378834551681 is 186155438873.

It is a cyclic number.

It is not a de Polignac number, because 378834551681 - 2² = 378834551677 is a prime.

It is a super-3 number, since 3×378834551681³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 378834551681.

It is not an unprimeable number, because it can be changed into a prime (378834557681) 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, 1790570 + ... + 1990931.

It is an arithmetic number, because the mean of its divisors is an integer number (25729339608).

Almost surely, 2^378834551681 is an apocalyptic number.

It is an amenable number.

378834551681 is a deficient number, since it is larger than the sum of its proper divisors (32834882047).

378834551681 is a wasteful number, since it uses less digits than its factorization.

378834551681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781672.

The product of its digits is 19353600, while the sum is 59.

The spelling of 378834551681 in words is "three hundred seventy-eight billion, eight hundred thirty-four million, five hundred fifty-one thousand, six hundred eighty-one".