126317273021518 has 4 divisors (see below), whose sum is σ = 189475909532280. Its totient is φ = 63158636510758.

The previous prime is 126317273021507. The next prime is 126317273021539. The reversal of 126317273021518 is 815120372713621.

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

It is a super-2 number, since 2×126317273021518² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31579318255378 + ... + 31579318255381.

It is an arithmetic number, because the mean of its divisors is an integer number (47368977383070).

Almost surely, 2^{126317273021518} is an apocalyptic number.

126317273021518 is a deficient number, since it is larger than the sum of its proper divisors (63158636510762).

126317273021518 is an equidigital number, since it uses as much as digits as its factorization.

126317273021518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63158636510761.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 126317273021518 in words is "one hundred twenty-six trillion, three hundred seventeen billion, two hundred seventy-three million, twenty-one thousand, five hundred eighteen".