126356653621 has 8 divisors (see below), whose sum is σ = 137852334144. Its totient is φ = 114862425120.

The previous prime is 126356653607. The next prime is 126356653651.

126356653621 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126356653621 - 2⁹ = 126356653109 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 (126356653651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176896 + ... + 532921.

It is an arithmetic number, because the mean of its divisors is an integer number (17231541768).

Almost surely, 2^126356653621 is an apocalyptic number.

126356653621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126356653621 is a deficient number, since it is larger than the sum of its proper divisors (11495680523).

126356653621 is a wasteful number, since it uses less digits than its factorization.

126356653621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726011.

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

It can be divided in two parts, 126356 and 653621, that added together give a palindrome (779977).

The spelling of 126356653621 in words is "one hundred twenty-six billion, three hundred fifty-six million, six hundred fifty-three thousand, six hundred twenty-one".