81011475069 has 16 divisors (see below), whose sum is σ = 123488673792. Its totient is φ = 46276290288.

The previous prime is 81011474861. The next prime is 81011475073. The reversal of 81011475069 is 96057411018.

It is not a de Polignac number, because 81011475069 - 2¹⁵ = 81011442301 is a prime.

It is a super-2 number, since 2×81011475069² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81011475069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81011471069) 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, 603469 + ... + 725394.

It is an arithmetic number, because the mean of its divisors is an integer number (7718042112).

Almost surely, 2^81011475069 is an apocalyptic number.

It is an amenable number.

81011475069 is a deficient number, since it is larger than the sum of its proper divisors (42477198723).

81011475069 is a wasteful number, since it uses less digits than its factorization.

81011475069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331776.

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 81011475069 in words is "eighty-one billion, eleven million, four hundred seventy-five thousand, sixty-nine".