12891652042 has 4 divisors (see below), whose sum is σ = 19337478066. Its totient is φ = 6445826020.

The previous prime is 12891652031. The next prime is 12891652069. The reversal of 12891652042 is 24025619821.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 12172929561 + 718722481 = 110331^2 + 26809^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 12891651986 and 12891652004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222913009 + ... + 3222913012.

Almost surely, 2^12891652042 is an apocalyptic number.

12891652042 is a deficient number, since it is larger than the sum of its proper divisors (6445826024).

12891652042 is an equidigital number, since it uses as much as digits as its factorization.

12891652042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445826023.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 12891652042 in words is "twelve billion, eight hundred ninety-one million, six hundred fifty-two thousand, forty-two".