378834217553 has 4 divisors (see below), whose sum is σ = 413273691888. Its totient is φ = 344394743220.

The previous prime is 378834217543. The next prime is 378834217577. The reversal of 378834217553 is 355712438873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 378834217553 - 2²⁸ = 378565782097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378834217543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17219737151 + ... + 17219737172.

It is an arithmetic number, because the mean of its divisors is an integer number (103318422972).

Almost surely, 2^378834217553 is an apocalyptic number.

It is an amenable number.

378834217553 is a deficient number, since it is larger than the sum of its proper divisors (34439474335).

378834217553 is a wasteful number, since it uses less digits than its factorization.

378834217553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34439474334.

The product of its digits is 16934400, while the sum is 56.

The spelling of 378834217553 in words is "three hundred seventy-eight billion, eight hundred thirty-four million, two hundred seventeen thousand, five hundred fifty-three".