126538615666 has 16 divisors (see below), whose sum is σ = 198426581568. Its totient is φ = 60406592400.

The previous prime is 126538615663. The next prime is 126538615673. The reversal of 126538615666 is 666516835621.

It is not an unprimeable number, because it can be changed into a prime (126538615663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2517480 + ... + 2567251.

It is an arithmetic number, because the mean of its divisors is an integer number (12401661348).

Almost surely, 2^126538615666 is an apocalyptic number.

126538615666 is a deficient number, since it is larger than the sum of its proper divisors (71887965902).

126538615666 is a wasteful number, since it uses less digits than its factorization.

126538615666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5085297.

The product of its digits is 9331200, while the sum is 55.

The spelling of 126538615666 in words is "one hundred twenty-six billion, five hundred thirty-eight million, six hundred fifteen thousand, six hundred sixty-six".