7850121025 has 12 divisors (see below), whose sum is σ = 10306747692. Its totient is φ = 5910679040.

The previous prime is 7850121017. The next prime is 7850121029. The reversal of 7850121025 is 5201210587.

It can be written as a sum of positive squares in 6 ways, for example, as 414163201 + 7435957824 = 20351^2 + 86232^2 .

It is not a de Polignac number, because 7850121025 - 2³ = 7850121017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7850121029) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9235012 + ... + 9235861.

It is an arithmetic number, because the mean of its divisors is an integer number (858895641).

Almost surely, 2^7850121025 is an apocalyptic number.

It is an amenable number.

7850121025 is a deficient number, since it is larger than the sum of its proper divisors (2456626667).

7850121025 is a wasteful number, since it uses less digits than its factorization.

7850121025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18470900 (or 18470895 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 7850121025 is about 88600.9087143016. The cubic root of 7850121025 is about 1987.4312643185.

The spelling of 7850121025 in words is "seven billion, eight hundred fifty million, one hundred twenty-one thousand, twenty-five".