2778955680401 has 4 divisors (see below), whose sum is σ = 2807604708132. Its totient is φ = 2750306652672.

The previous prime is 2778955680379. The next prime is 2778955680407. The reversal of 2778955680401 is 1040865598772.

It is a Cunningham number, because it is equal to 1667020²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1247858789776 + 1531096890625 = 1117076^2 + 1237375^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778955680401 - 2¹⁰ = 2778955679377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778955680407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14324513720 + ... + 14324513913.

It is an arithmetic number, because the mean of its divisors is an integer number (701901177033).

Almost surely, 2^{2778955680401} is an apocalyptic number.

It is an amenable number.

2778955680401 is a deficient number, since it is larger than the sum of its proper divisors (28649027731).

2778955680401 is an equidigital number, since it uses as much as digits as its factorization.

2778955680401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28649027730.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 2778955680401 in words is "two trillion, seven hundred seventy-eight billion, nine hundred fifty-five million, six hundred eighty thousand, four hundred one".