2778025525505 has 24 divisors (see below), whose sum is σ = 3382234646328. Its totient is φ = 2190476768256.

The previous prime is 2778025525501. The next prime is 2778025525507. The reversal of 2778025525505 is 5055255208772.

It can be written as a sum of positive squares in 12 ways, for example, as 541466392336 + 2236559133169 = 735844^2 + 1495513^2 .

It is not a de Polignac number, because 2778025525505 - 2² = 2778025525501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2778025525501) 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 23 ways as a sum of consecutive naturals, for example, 39746069 + ... + 39815901.

It is an arithmetic number, because the mean of its divisors is an integer number (140926443597).

Almost surely, 2^{2778025525505} is an apocalyptic number.

It is an amenable number.

2778025525505 is a deficient number, since it is larger than the sum of its proper divisors (604209120823).

2778025525505 is an equidigital number, since it uses as much as digits as its factorization.

2778025525505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71477 (or 71404 counting only the distinct ones).

The product of its (nonzero) digits is 9800000, while the sum is 53.

The spelling of 2778025525505 in words is "two trillion, seven hundred seventy-eight billion, twenty-five million, five hundred twenty-five thousand, five hundred five".