126551659081 has 9 divisors (see below), whose sum is σ = 132301687021. Its totient is φ = 121041586732.

The previous prime is 126551659079. The next prime is 126551659123. The reversal of 126551659081 is 180956155621.

The square root of 126551659081 is 355741.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 126551659081 - 2¹ = 126551659079 is a prime.

It is a super-2 number, since 2×126551659081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126551659001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8174310 + ... + 8189776.

Almost surely, 2^126551659081 is an apocalyptic number.

126551659081 is the 355741-st square number.

126551659081 is the 177871-st centered octagonal number.

It is an amenable number.

126551659081 is a deficient number, since it is larger than the sum of its proper divisors (5750027940).

126551659081 is an frugal number, since it uses more digits than its factorization.

126551659081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30980 (or 15490 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 49.

Multiplying 126551659081 by its sum of digits (49), we get a square (6201031294969 = 2490187²).

The spelling of 126551659081 in words is "one hundred twenty-six billion, five hundred fifty-one million, six hundred fifty-nine thousand, eighty-one".