126156538557 has 32 divisors (see below), whose sum is σ = 214610754560. Its totient is φ = 71747771760.

The previous prime is 126156538531. The next prime is 126156538567. The reversal of 126156538557 is 755835651621.

126156538557 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 56 + 5 + 38 + 557 = 666.

It is not a de Polignac number, because 126156538557 - 2¹⁵ = 126156505789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126156538567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1541863 + ... + 1621620.

It is an arithmetic number, because the mean of its divisors is an integer number (6706586080).

Almost surely, 2^126156538557 is an apocalyptic number.

It is an amenable number.

126156538557 is a deficient number, since it is larger than the sum of its proper divisors (88454216003).

126156538557 is a wasteful number, since it uses less digits than its factorization.

126156538557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163710 (or 3163704 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 54.

The spelling of 126156538557 in words is "one hundred twenty-six billion, one hundred fifty-six million, five hundred thirty-eight thousand, five hundred fifty-seven".