126651890771 has 4 divisors (see below), whose sum is σ = 144745018032. Its totient is φ = 108558763512.

The previous prime is 126651890767. The next prime is 126651890797. The reversal of 126651890771 is 177098156621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177098156621 = 190699 ⋅928679.

It is a cyclic number.

It is not a de Polignac number, because 126651890771 - 2² = 126651890767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126651895771) 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, 9046563620 + ... + 9046563633.

It is an arithmetic number, because the mean of its divisors is an integer number (36186254508).

Almost surely, 2^126651890771 is an apocalyptic number.

126651890771 is a deficient number, since it is larger than the sum of its proper divisors (18093127261).

126651890771 is an equidigital number, since it uses as much as digits as its factorization.

126651890771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18093127260.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 126651890771 in words is "one hundred twenty-six billion, six hundred fifty-one million, eight hundred ninety thousand, seven hundred seventy-one".