378003795661 has 4 divisors (see below), whose sum is σ = 378017614300. Its totient is φ = 377989977024.

The previous prime is 378003795643. The next prime is 378003795677. The reversal of 378003795661 is 166597300873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166597300873 = 61 ⋅2731103293.

It can be written as a sum of positive squares in 2 ways, for example, as 93174510025 + 284829285636 = 305245^2 + 533694^2 .

It is a cyclic number.

It is not a de Polignac number, because 378003795661 - 2⁹ = 378003795149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378003795601) 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, 6868206 + ... + 6923023.

It is an arithmetic number, because the mean of its divisors is an integer number (94504403575).

Almost surely, 2^378003795661 is an apocalyptic number.

It is an amenable number.

378003795661 is a deficient number, since it is larger than the sum of its proper divisors (13818639).

378003795661 is a wasteful number, since it uses less digits than its factorization.

378003795661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13818638.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 378003795661 in words is "three hundred seventy-eight billion, three million, seven hundred ninety-five thousand, six hundred sixty-one".