2378346911721 has 81 divisors (see below), whose sum is σ = 4012738510053. Its totient is φ = 1356139319040.

The previous prime is 2378346911671. The next prime is 2378346911737. The reversal of 2378346911721 is 1271196438732.

The square root of 2378346911721 is 1542189.

It is a perfect power (a square), and thus also a powerful number.

2378346911721 is a `hidden beast` number, since 2 + 3 + 7 + 8 + 3 + 469 + 1 + 172 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 44675163225 + 2333671748496 = 211365^2 + 1527636^2 .

It is not a de Polignac number, because 2378346911721 - 2³³ = 2369756977129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2378346911761) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 865166655 + ... + 865169403.

Almost surely, 2^{2378346911721} is an apocalyptic number.

2378346911721 is the 1542189-th square number.

2378346911721 is the 771095-th centered octagonal number.

It is an amenable number.

2378346911721 is a deficient number, since it is larger than the sum of its proper divisors (1634391598332).

2378346911721 is an equidigital number, since it uses as much as digits as its factorization.

2378346911721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560 (or 2780 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 2378346911721 in words is "two trillion, three hundred seventy-eight billion, three hundred forty-six million, nine hundred eleven thousand, seven hundred twenty-one".