126521354525 has 12 divisors (see below), whose sum is σ = 156896625012. Its totient is φ = 101210538240.

The previous prime is 126521354503. The next prime is 126521354537. The reversal of 126521354525 is 525453125621.

It can be written as a sum of positive squares in 6 ways, for example, as 18686616601 + 107834737924 = 136699^2 + 328382^2 .

It is not a de Polignac number, because 126521354525 - 2¹⁰ = 126521353501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 251327 + ... + 562323.

It is an arithmetic number, because the mean of its divisors is an integer number (13074718751).

Almost surely, 2^126521354525 is an apocalyptic number.

It is an amenable number.

126521354525 is a deficient number, since it is larger than the sum of its proper divisors (30375270487).

126521354525 is a wasteful number, since it uses less digits than its factorization.

126521354525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327280 (or 327275 counting only the distinct ones).

The product of its digits is 360000, while the sum is 41.

The spelling of 126521354525 in words is "one hundred twenty-six billion, five hundred twenty-one million, three hundred fifty-four thousand, five hundred twenty-five".