126815003873 has 4 divisors (see below), whose sum is σ = 126816552960. Its totient is φ = 126813454788.

The previous prime is 126815003851. The next prime is 126815003969. The reversal of 126815003873 is 378300518621.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 378300518621 = 2251 ⋅168058871.

It is a cyclic number.

It is not a de Polignac number, because 126815003873 - 2⁸ = 126815003617 is a prime.

It is a super-3 number, since 3×126815003873³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126815003803) 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, 644465 + ... + 817902.

It is an arithmetic number, because the mean of its divisors is an integer number (31704138240).

Almost surely, 2^126815003873 is an apocalyptic number.

It is an amenable number.

126815003873 is a deficient number, since it is larger than the sum of its proper divisors (1549087).

126815003873 is an equidigital number, since it uses as much as digits as its factorization.

126815003873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549086.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 126815003873 in words is "one hundred twenty-six billion, eight hundred fifteen million, three thousand, eight hundred seventy-three".