12057945581 has 16 divisors (see below), whose sum is σ = 13436167680. Its totient is φ = 10728373680.

The previous prime is 12057945533. The next prime is 12057945587. The reversal of 12057945581 is 18554975021.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12057945581 is a prime.

It is a super-2 number, since 2×12057945581² (a number of 21 digits) contains 22 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 (12057945587) 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, 106400 + ... + 188246.

It is an arithmetic number, because the mean of its divisors is an integer number (839760480).

Almost surely, 2^12057945581 is an apocalyptic number.

12057945581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12057945581 is a deficient number, since it is larger than the sum of its proper divisors (1378222099).

12057945581 is a wasteful number, since it uses less digits than its factorization.

12057945581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82144.

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 12057945581 in words is "twelve billion, fifty-seven million, nine hundred forty-five thousand, five hundred eighty-one".