126006691644 has 144 divisors (see below), whose sum is σ = 345739054752. Its totient is φ = 38546067456.

The previous prime is 126006691631. The next prime is 126006691649. The reversal of 126006691644 is 446196600621.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 126006691644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126006691649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5275152 + ... + 5298984.

It is an arithmetic number, because the mean of its divisors is an integer number (2400965658).

Almost surely, 2^126006691644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126006691644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172869527376).

126006691644 is an abundant number, since it is smaller than the sum of its proper divisors (219732363108).

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

126006691644 is a wasteful number, since it uses less digits than its factorization.

126006691644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24076 (or 24071 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 126006691644 in words is "one hundred twenty-six billion, six million, six hundred ninety-one thousand, six hundred forty-four".