81881250202 has 8 divisors (see below), whose sum is σ = 122849974836. Its totient is φ = 40931258592.

The previous prime is 81881250179. The next prime is 81881250229. The reversal of 81881250202 is 20205218818.

It is a Cunningham number, because it is equal to 286149²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 81881250201 + 1 = 286149^2 + 1^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672323 + ... + 4689814.

Almost surely, 2^81881250202 is an apocalyptic number.

81881250202 is a deficient number, since it is larger than the sum of its proper divisors (40968724634).

81881250202 is a wasteful number, since it uses less digits than its factorization.

81881250202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9366512.

The product of its (nonzero) digits is 20480, while the sum is 37.

The spelling of 81881250202 in words is "eighty-one billion, eight hundred eighty-one million, two hundred fifty thousand, two hundred two".