12721661054 has 16 divisors (see below), whose sum is σ = 19914895008. Its totient is φ = 6083438592.

The previous prime is 12721661047. The next prime is 12721661059. The reversal of 12721661054 is 45016612721.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721661059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439394 + ... + 467450.

It is an arithmetic number, because the mean of its divisors is an integer number (1244680938).

Almost surely, 2^12721661054 is an apocalyptic number.

12721661054 is a deficient number, since it is larger than the sum of its proper divisors (7193233954).

12721661054 is a wasteful number, since it uses less digits than its factorization.

12721661054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37939.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 12721661054 in words is "twelve billion, seven hundred twenty-one million, six hundred sixty-one thousand, fifty-four".