81066370471 has 16 divisors (see below), whose sum is σ = 83039224320. Its totient is φ = 79104271680.

The previous prime is 81066370453. The next prime is 81066370477. The reversal of 81066370471 is 17407366018.

It is a cyclic number.

It is not a de Polignac number, because 81066370471 - 2³⁵ = 46706632103 is a prime.

It is a super-3 number, since 3×81066370471³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81066370477) 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, 26430280 + ... + 26433346.

It is an arithmetic number, because the mean of its divisors is an integer number (5189951520).

Almost surely, 2^81066370471 is an apocalyptic number.

81066370471 is a deficient number, since it is larger than the sum of its proper divisors (1972853849).

81066370471 is a wasteful number, since it uses less digits than its factorization.

81066370471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 81066370471 in words is "eighty-one billion, sixty-six million, three hundred seventy thousand, four hundred seventy-one".