81224755937 has 16 divisors (see below), whose sum is σ = 91763642880. Its totient is φ = 71371675200.

The previous prime is 81224755933. The next prime is 81224755949. The reversal of 81224755937 is 73955742218.

It is a cyclic number.

It is not a de Polignac number, because 81224755937 - 2² = 81224755933 is a prime.

81224755937 is a modest number, since divided by 755937 gives 81224 as remainder.

It is not an unprimeable number, because it can be changed into a prime (81224755933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1490489 + ... + 1544022.

It is an arithmetic number, because the mean of its divisors is an integer number (5735227680).

Almost surely, 2^81224755937 is an apocalyptic number.

It is an amenable number.

81224755937 is a deficient number, since it is larger than the sum of its proper divisors (10538886943).

81224755937 is a wasteful number, since it uses less digits than its factorization.

81224755937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034624.

The product of its digits is 4233600, while the sum is 53.

The spelling of 81224755937 in words is "eighty-one billion, two hundred twenty-four million, seven hundred fifty-five thousand, nine hundred thirty-seven".