126635536621 has 16 divisors (see below), whose sum is σ = 146501828928. Its totient is φ = 108182649600.

The previous prime is 126635536619. The next prime is 126635536637.

126635536621 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 126635536621 - 2¹ = 126635536619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126635531621) 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, 406350 + ... + 646831.

It is an arithmetic number, because the mean of its divisors is an integer number (9156364308).

Almost surely, 2^126635536621 is an apocalyptic number.

126635536621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126635536621 is a deficient number, since it is larger than the sum of its proper divisors (19866292307).

126635536621 is a wasteful number, since it uses less digits than its factorization.

126635536621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053852.

The product of its digits is 1166400, while the sum is 46.

The spelling of 126635536621 in words is "one hundred twenty-six billion, six hundred thirty-five million, five hundred thirty-six thousand, six hundred twenty-one".