126387783621 has 64 divisors (see below), whose sum is σ = 213255383040. Its totient is φ = 73230030720.

The previous prime is 126387783617. The next prime is 126387783631.

It is a happy number.

126387783621 is a `hidden beast` number, since 1 + 2 + 6 + 3 + 8 + 7 + 7 + 8 + 3 + 621 = 666.

126387783621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 126387783621 - 2² = 126387783617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126387783601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17982510 + ... + 17989536.

It is an arithmetic number, because the mean of its divisors is an integer number (3332115360).

Almost surely, 2^126387783621 is an apocalyptic number.

126387783621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126387783621 is a deficient number, since it is larger than the sum of its proper divisors (86867599419).

126387783621 is a wasteful number, since it uses less digits than its factorization.

126387783621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9703 (or 9697 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 126387783621 in words is "one hundred twenty-six billion, three hundred eighty-seven million, seven hundred eighty-three thousand, six hundred twenty-one".