81298470706 has 4 divisors (see below), whose sum is σ = 121947706062. Its totient is φ = 40649235352.

The previous prime is 81298470647. The next prime is 81298470769. The reversal of 81298470706 is 60707489218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65122446481 + 16176024225 = 255191^2 + 127185^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20324617675 + ... + 20324617678.

Almost surely, 2^81298470706 is an apocalyptic number.

81298470706 is a deficient number, since it is larger than the sum of its proper divisors (40649235356).

81298470706 is a wasteful number, since it uses less digits than its factorization.

81298470706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40649235355.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 81298470706 in words is "eighty-one billion, two hundred ninety-eight million, four hundred seventy thousand, seven hundred six".