126620056018 has 4 divisors (see below), whose sum is σ = 189930084030. Its totient is φ = 63310028008.

The previous prime is 126620055941. The next prime is 126620056019. The reversal of 126620056018 is 810650026621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810650026621 = 2389 ⋅339326089.

It can be written as a sum of positive squares in only one way, i.e., 71543945529 + 55076110489 = 267477^2 + 234683^2 .

It is not an unprimeable number, because it can be changed into a prime (126620056019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31655014003 + ... + 31655014006.

Almost surely, 2^126620056018 is an apocalyptic number.

126620056018 is a deficient number, since it is larger than the sum of its proper divisors (63310028012).

126620056018 is an equidigital number, since it uses as much as digits as its factorization.

126620056018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63310028011.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 126620056018 in words is "one hundred twenty-six billion, six hundred twenty million, fifty-six thousand, eighteen".