7778001125 has 8 divisors (see below), whose sum is σ = 9706945560. Its totient is φ = 6222400800.

The previous prime is 7778001113. The next prime is 7778001137. The reversal of 7778001125 is 5211008777.

It is an interprime number because it is at equal distance from previous prime (7778001113) and next prime (7778001137).

It can be written as a sum of positive squares in 4 ways, for example, as 1569506689 + 6208494436 = 39617^2 + 78794^2 .

It is not a de Polignac number, because 7778001125 - 2⁸ = 7778000869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31111880 + ... + 31112129.

It is an arithmetic number, because the mean of its divisors is an integer number (1213368195).

Almost surely, 2^7778001125 is an apocalyptic number.

It is an amenable number.

7778001125 is a deficient number, since it is larger than the sum of its proper divisors (1928944435).

7778001125 is an equidigital number, since it uses as much as digits as its factorization.

7778001125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62224024 (or 62224014 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 7778001125 is about 88192.9766194565. The cubic root of 7778001125 is about 1981.3262825270.

The spelling of 7778001125 in words is "seven billion, seven hundred seventy-eight million, one thousand, one hundred twenty-five".