126557057987 has 8 divisors (see below), whose sum is σ = 127115692704. Its totient is φ = 125998555968.

The previous prime is 126557057959. The next prime is 126557057989. The reversal of 126557057987 is 789750755621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126557057987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126557057989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211578 + ... + 2268080.

It is an arithmetic number, because the mean of its divisors is an integer number (15889461588).

Almost surely, 2^126557057987 is an apocalyptic number.

126557057987 is a deficient number, since it is larger than the sum of its proper divisors (558634717).

126557057987 is an equidigital number, since it uses as much as digits as its factorization.

126557057987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66349.

The product of its (nonzero) digits is 37044000, while the sum is 62.

The spelling of 126557057987 in words is "one hundred twenty-six billion, five hundred fifty-seven million, fifty-seven thousand, nine hundred eighty-seven".