81600011 has 4 divisors (see below), whose sum is σ = 81700224. Its totient is φ = 81499800.

The previous prime is 81599993. The next prime is 81600023. The reversal of 81600011 is 11000618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81600011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81600511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48875 + ... + 50516.

It is an arithmetic number, because the mean of its divisors is an integer number (20425056).

Almost surely, 2^81600011 is an apocalyptic number.

81600011 is a deficient number, since it is larger than the sum of its proper divisors (100213).

81600011 is an equidigital number, since it uses as much as digits as its factorization.

81600011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100212.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 81600011 is about 9033.2724413692. The cubic root of 81600011 is about 433.7405965400.

Adding to 81600011 its reverse (11000618), we get a palindrome (92600629).

The spelling of 81600011 in words is "eighty-one million, six hundred thousand, eleven".