126521234655 has 16 divisors (see below), whose sum is σ = 209414458080. Its totient is φ = 65151164288.

The previous prime is 126521234633. The next prime is 126521234657. The reversal of 126521234655 is 556432125621.

It is not a de Polignac number, because 126521234655 - 2¹⁵ = 126521201887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126521234657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145426272 + ... + 145427141.

It is an arithmetic number, because the mean of its divisors is an integer number (13088403630).

Almost surely, 2^126521234655 is an apocalyptic number.

126521234655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

126521234655 is a deficient number, since it is larger than the sum of its proper divisors (82893223425).

126521234655 is a wasteful number, since it uses less digits than its factorization.

126521234655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290853450.

The product of its digits is 432000, while the sum is 42.

The spelling of 126521234655 in words is "one hundred twenty-six billion, five hundred twenty-one million, two hundred thirty-four thousand, six hundred fifty-five".