378979979873 has 4 divisors (see below), whose sum is σ = 413432705328. Its totient is φ = 344527254420.

The previous prime is 378979979857. The next prime is 378979979887.

378979979873 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 378979979873 - 2⁴ = 378979979857 is a prime.

It is a super-2 number, since 2×378979979873² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378979976873) 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, 17226362711 + ... + 17226362732.

It is an arithmetic number, because the mean of its divisors is an integer number (103358176332).

Almost surely, 2^378979979873 is an apocalyptic number.

It is an amenable number.

378979979873 is a deficient number, since it is larger than the sum of its proper divisors (34452725455).

378979979873 is a wasteful number, since it uses less digits than its factorization.

378979979873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34452725454.

The product of its digits is 9073705536, while the sum is 86.

The spelling of 378979979873 in words is "three hundred seventy-eight billion, nine hundred seventy-nine million, nine hundred seventy-nine thousand, eight hundred seventy-three".