378355553 has 4 divisors (see below), whose sum is σ = 400611780. Its totient is φ = 356099328.

The previous prime is 378355517. The next prime is 378355577. The reversal of 378355553 is 355553873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301126609 + 77228944 = 17353^2 + 8788^2 .

It is a cyclic number.

It is not a de Polignac number, because 378355553 - 2⁸ = 378355297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378355853) 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, 11128088 + ... + 11128121.

It is an arithmetic number, because the mean of its divisors is an integer number (100152945).

Almost surely, 2^378355553 is an apocalyptic number.

It is an amenable number.

378355553 is a deficient number, since it is larger than the sum of its proper divisors (22256227).

378355553 is a wasteful number, since it uses less digits than its factorization.

378355553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22256226.

The product of its digits is 945000, while the sum is 44.

The square root of 378355553 is about 19451.3637825218. The cubic root of 378355553 is about 723.2693101443.

The spelling of 378355553 in words is "three hundred seventy-eight million, three hundred fifty-five thousand, five hundred fifty-three".