126621660343 has 4 divisors (see below), whose sum is σ = 129010748328. Its totient is φ = 124232572360.

The previous prime is 126621660323. The next prime is 126621660367. The reversal of 126621660343 is 343066126621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126621660343 - 2¹⁷ = 126621529271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126621660296 and 126621660305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126621660323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1194543913 + ... + 1194544018.

It is an arithmetic number, because the mean of its divisors is an integer number (32252687082).

Almost surely, 2^126621660343 is an apocalyptic number.

126621660343 is a deficient number, since it is larger than the sum of its proper divisors (2389087985).

126621660343 is an equidigital number, since it uses as much as digits as its factorization.

126621660343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389087984.

The product of its (nonzero) digits is 186624, while the sum is 40.

Adding to 126621660343 its reverse (343066126621), we get a palindrome (469687786964).

The spelling of 126621660343 in words is "one hundred twenty-six billion, six hundred twenty-one million, six hundred sixty thousand, three hundred forty-three".