126291666289240 has 128 divisors (see below), whose sum is σ = 295188990405120. Its totient is φ = 48590541619200.

The previous prime is 126291666289231. The next prime is 126291666289297. The reversal of 126291666289240 is 42982666192621.

It is a happy number.

It is a super-2 number, since 2×126291666289240² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309990952 + ... + 310398088.

It is an arithmetic number, because the mean of its divisors is an integer number (2306163987540).

Almost surely, 2^{126291666289240} is an apocalyptic number.

126291666289240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126291666289240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147594495202560).

126291666289240 is an abundant number, since it is smaller than the sum of its proper divisors (168897324115880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126291666289240 is a wasteful number, since it uses less digits than its factorization.

126291666289240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409853 (or 409849 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 64.

The spelling of 126291666289240 in words is "one hundred twenty-six trillion, two hundred ninety-one billion, six hundred sixty-six million, two hundred eighty-nine thousand, two hundred forty".