2123178982461 has 6 divisors (see below), whose sum is σ = 3066814085790. Its totient is φ = 1415452654968.

The previous prime is 2123178982451. The next prime is 2123178982481. The reversal of 2123178982461 is 1642898713212.

2123178982461 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 178 + 9 + 8 + 2 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1501651725561 + 621527256900 = 1225419^2 + 788370^2 .

It is not a de Polignac number, because 2123178982461 - 2⁵ = 2123178982429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123178982398 and 2123178982407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123178982451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117954387906 + ... + 117954387923.

It is an arithmetic number, because the mean of its divisors is an integer number (511135680965).

Almost surely, 2^{2123178982461} is an apocalyptic number.

It is an amenable number.

2123178982461 is a deficient number, since it is larger than the sum of its proper divisors (943635103329).

2123178982461 is a wasteful number, since it uses less digits than its factorization.

2123178982461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235908775835 (or 235908775832 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The spelling of 2123178982461 in words is "two trillion, one hundred twenty-three billion, one hundred seventy-eight million, nine hundred eighty-two thousand, four hundred sixty-one".