81950700625 has 10 divisors (see below), whose sum is σ = 102405596282. Its totient is φ = 65560560000.

The previous prime is 81950700619. The next prime is 81950700661. The reversal of 81950700625 is 52600705918.

It can be written as a sum of positive squares in 5 ways, for example, as 8566057809 + 73384642816 = 92553^2 + 270896^2 .

It is not a de Polignac number, because 81950700625 - 2³ = 81950700617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65559936 + ... + 65561185.

Almost surely, 2^81950700625 is an apocalyptic number.

It is an amenable number.

81950700625 is a deficient number, since it is larger than the sum of its proper divisors (20454895657).

81950700625 is an equidigital number, since it uses as much as digits as its factorization.

81950700625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131121141 (or 131121126 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 81950700625 in words is "eighty-one billion, nine hundred fifty million, seven hundred thousand, six hundred twenty-five".