2178613155457 has 2 divisors, whose sum is σ = 2178613155458. Its totient is φ = 2178613155456.

The previous prime is 2178613155373. The next prime is 2178613155479. The reversal of 2178613155457 is 7545513168712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1778678336241 + 399934819216 = 1333671^2 + 632404^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178613155457 - 2³⁹ = 1628857341569 is a prime.

It is a super-2 number, since 2×2178613155457² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2178613155398 and 2178613155407.

It is not a weakly prime, because it can be changed into another prime (2178613155497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089306577728 + 1089306577729.

It is an arithmetic number, because the mean of its divisors is an integer number (1089306577729).

Almost surely, 2^{2178613155457} is an apocalyptic number.

It is an amenable number.

2178613155457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178613155457 is an equidigital number, since it uses as much as digits as its factorization.

2178613155457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056000, while the sum is 55.

The spelling of 2178613155457 in words is "two trillion, one hundred seventy-eight billion, six hundred thirteen million, one hundred fifty-five thousand, four hundred fifty-seven".