7491681025 has 18 divisors (see below), whose sum is σ = 9386736450. Its totient is φ = 5931371520.

The previous prime is 7491681013. The next prime is 7491681047. The reversal of 7491681025 is 5201861947.

It can be written as a sum of positive squares in 9 ways, for example, as 2276530369 + 5215150656 = 47713^2 + 72216^2 .

It is not a de Polignac number, because 7491681025 - 2¹⁹ = 7491156737 is a prime.

It is a super-2 number, since 2×7491681025² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 219301 + ... + 251149.

Almost surely, 2^7491681025 is an apocalyptic number.

It is an amenable number.

7491681025 is a deficient number, since it is larger than the sum of its proper divisors (1895055425).

7491681025 is an equidigital number, since it uses as much as digits as its factorization.

7491681025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32053 (or 31951 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 7491681025 is about 86554.4974279211. The cubic root of 7491681025 is about 1956.7098264781.

The spelling of 7491681025 in words is "seven billion, four hundred ninety-one million, six hundred eighty-one thousand, twenty-five".