81250709799626 has 8 divisors (see below), whose sum is σ = 121888140035844. Its totient is φ = 40621329787680.

The previous prime is 81250709799617. The next prime is 81250709799629. The reversal of 81250709799626 is 62699790705218.

It can be written as a sum of positive squares in 2 ways, for example, as 80960674774225 + 290035025401 = 8997815^2 + 538549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81250709799626.

It is not an unprimeable number, because it can be changed into a prime (81250709799629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012530835 + ... + 2012571206.

Almost surely, 2^{81250709799626} is an apocalyptic number.

81250709799626 is a deficient number, since it is larger than the sum of its proper divisors (40637430236218).

81250709799626 is a wasteful number, since it uses less digits than its factorization.

81250709799626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025112136.

The product of its (nonzero) digits is 205752960, while the sum is 71.

The spelling of 81250709799626 in words is "eighty-one trillion, two hundred fifty billion, seven hundred nine million, seven hundred ninety-nine thousand, six hundred twenty-six".