81547950769 has 16 divisors (see below), whose sum is σ = 84022061760. Its totient is φ = 79097760000.

The previous prime is 81547950761. The next prime is 81547950791. The reversal of 81547950769 is 96705974518.

It is a cyclic number.

It is not a de Polignac number, because 81547950769 - 2³ = 81547950761 is a prime.

It is a super-2 number, since 2×81547950769² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81547950761) 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, 9087717 + ... + 9096685.

It is an arithmetic number, because the mean of its divisors is an integer number (5251378860).

Almost surely, 2^81547950769 is an apocalyptic number.

It is an amenable number.

81547950769 is a deficient number, since it is larger than the sum of its proper divisors (2474110991).

81547950769 is a wasteful number, since it uses less digits than its factorization.

81547950769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10272.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 81547950769 in words is "eighty-one billion, five hundred forty-seven million, nine hundred fifty thousand, seven hundred sixty-nine".