2078166981305 has 8 divisors (see below), whose sum is σ = 2509684457352. Its totient is φ = 1651944198528.

The previous prime is 2078166981301. The next prime is 2078166981313. The reversal of 2078166981305 is 5031896618702.

It can be written as a sum of positive squares in 4 ways, for example, as 253838622976 + 1824328358329 = 503824^2 + 1350677^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2078166981305 - 2² = 2078166981301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078166981301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323672452 + ... + 1323674021.

It is an arithmetic number, because the mean of its divisors is an integer number (313710557169).

Almost surely, 2^{2078166981305} is an apocalyptic number.

It is an amenable number.

2078166981305 is a deficient number, since it is larger than the sum of its proper divisors (431517476047).

2078166981305 is a wasteful number, since it uses less digits than its factorization.

2078166981305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647346635.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 2078166981305 in words is "two trillion, seventy-eight billion, one hundred sixty-six million, nine hundred eighty-one thousand, three hundred five".