12049700081 has 4 divisors (see below), whose sum is σ = 12061502964. Its totient is φ = 12037897200.

The previous prime is 12049700077. The next prime is 12049700099. The reversal of 12049700081 is 18000794021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18000794021 = 7 ⋅2571542003.

It can be written as a sum of positive squares in 2 ways, for example, as 6708429025 + 5341271056 = 81905^2 + 73084^2 .

It is a cyclic number.

It is not a de Polignac number, because 12049700081 - 2² = 12049700077 is a prime.

It is a super-2 number, since 2×12049700081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12049700021) 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, 5899910 + ... + 5901951.

It is an arithmetic number, because the mean of its divisors is an integer number (3015375741).

Almost surely, 2^12049700081 is an apocalyptic number.

It is an amenable number.

12049700081 is a deficient number, since it is larger than the sum of its proper divisors (11802883).

12049700081 is a wasteful number, since it uses less digits than its factorization.

12049700081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11802882.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 12049700081 in words is "twelve billion, forty-nine million, seven hundred thousand, eighty-one".