7978523425 has 6 divisors (see below), whose sum is σ = 9893369078. Its totient is φ = 6382818720.

The previous prime is 7978523369. The next prime is 7978523489. The reversal of 7978523425 is 5243258797.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 63218401 + 7915305024 = 7951^2 + 88968^2 .

It is not a de Polignac number, because 7978523425 - 2¹⁹ = 7977999137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159570444 + ... + 159570493.

Almost surely, 2^7978523425 is an apocalyptic number.

It is an amenable number.

7978523425 is a deficient number, since it is larger than the sum of its proper divisors (1914845653).

7978523425 is a wasteful number, since it uses less digits than its factorization.

7978523425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319140947 (or 319140942 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 52.

The square root of 7978523425 is about 89322.5807117103. The cubic root of 7978523425 is about 1998.2086814847.

The spelling of 7978523425 in words is "seven billion, nine hundred seventy-eight million, five hundred twenty-three thousand, four hundred twenty-five".