81537756107 has 8 divisors (see below), whose sum is σ = 85113717120. Its totient is φ = 78020902080.

The previous prime is 81537756043. The next prime is 81537756151. The reversal of 81537756107 is 70165773518.

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

It is a cyclic number.

It is not a de Polignac number, because 81537756107 - 2⁶ = 81537756043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81537756907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14773928 + ... + 14779445.

It is an arithmetic number, because the mean of its divisors is an integer number (10639214640).

Almost surely, 2^81537756107 is an apocalyptic number.

81537756107 is a deficient number, since it is larger than the sum of its proper divisors (3575961013).

81537756107 is a wasteful number, since it uses less digits than its factorization.

81537756107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29553493.

The product of its (nonzero) digits is 1234800, while the sum is 50.

The spelling of 81537756107 in words is "eighty-one billion, five hundred thirty-seven million, seven hundred fifty-six thousand, one hundred seven".