378857577761 has 4 divisors (see below), whose sum is σ = 408000468372. Its totient is φ = 349714687152.

The previous prime is 378857577727. The next prime is 378857577781. The reversal of 378857577761 is 167775758873.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167775758873 = 317 ⋅529261069.

It can be written as a sum of positive squares in 2 ways, for example, as 160595753536 + 218261824225 = 400744^2 + 467185^2 .

It is a cyclic number.

It is not a de Polignac number, because 378857577761 - 2²² = 378853383457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378857577701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14571445286 + ... + 14571445311.

It is an arithmetic number, because the mean of its divisors is an integer number (102000117093).

Almost surely, 2^378857577761 is an apocalyptic number.

It is an amenable number.

378857577761 is a deficient number, since it is larger than the sum of its proper divisors (29142890611).

378857577761 is a wasteful number, since it uses less digits than its factorization.

378857577761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29142890610.

The product of its digits is 484041600, while the sum is 71.

The spelling of 378857577761 in words is "three hundred seventy-eight billion, eight hundred fifty-seven million, five hundred seventy-seven thousand, seven hundred sixty-one".