12555043397 has 8 divisors (see below), whose sum is σ = 13524639744. Its totient is φ = 11585993328.

The previous prime is 12555043381. The next prime is 12555043441. The reversal of 12555043397 is 79334055521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12555043397 - 2⁴ = 12555043381 is a prime.

It is a super-2 number, since 2×12555043397² (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 (12555043357) 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, 88193 + ... + 181350.

It is an arithmetic number, because the mean of its divisors is an integer number (1690579968).

Almost surely, 2^12555043397 is an apocalyptic number.

It is an amenable number.

12555043397 is a deficient number, since it is larger than the sum of its proper divisors (969596347).

12555043397 is a wasteful number, since it uses less digits than its factorization.

12555043397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273139.

The product of its (nonzero) digits is 567000, while the sum is 44.

The spelling of 12555043397 in words is "twelve billion, five hundred fifty-five million, forty-three thousand, three hundred ninety-seven".