126273863649 has 4 divisors (see below), whose sum is σ = 168365151536. Its totient is φ = 84182575764.

The previous prime is 126273863647. The next prime is 126273863659. The reversal of 126273863649 is 946368372621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 126273863649 - 2¹ = 126273863647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126273863647) 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, 21045643939 + ... + 21045643944.

It is an arithmetic number, because the mean of its divisors is an integer number (42091287884).

Almost surely, 2^126273863649 is an apocalyptic number.

It is an amenable number.

126273863649 is a deficient number, since it is larger than the sum of its proper divisors (42091287887).

126273863649 is an equidigital number, since it uses as much as digits as its factorization.

126273863649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42091287886.

The product of its digits is 15676416, while the sum is 57.

The spelling of 126273863649 in words is "one hundred twenty-six billion, two hundred seventy-three million, eight hundred sixty-three thousand, six hundred forty-nine".