81224755970 has 16 divisors (see below), whose sum is σ = 148207364280. Its totient is φ = 32044834944.

The previous prime is 81224755949. The next prime is 81224755973. The reversal of 81224755970 is 7955742218.

It can be written as a sum of positive squares in 4 ways, for example, as 48709814209 + 32514941761 = 220703^2 + 180319^2 .

It is not an unprimeable number, because it can be changed into a prime (81224755973) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 55632665 + ... + 55634124.

Almost surely, 2^81224755970 is an apocalyptic number.

81224755970 is a deficient number, since it is larger than the sum of its proper divisors (66982608310).

81224755970 is a wasteful number, since it uses less digits than its factorization.

81224755970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111266869.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 81224755970 in words is "eighty-one billion, two hundred twenty-four million, seven hundred fifty-five thousand, nine hundred seventy".