126358721873 has 4 divisors (see below), whose sum is σ = 126359500608. Its totient is φ = 126357943140.

The previous prime is 126358721857. The next prime is 126358721887. The reversal of 126358721873 is 378127853621.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 126358721873 - 2⁴ = 126358721857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126358721803) 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, 43661 + ... + 504602.

It is an arithmetic number, because the mean of its divisors is an integer number (31589875152).

Almost surely, 2^126358721873 is an apocalyptic number.

It is an amenable number.

126358721873 is a deficient number, since it is larger than the sum of its proper divisors (778735).

126358721873 is an equidigital number, since it uses as much as digits as its factorization.

126358721873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778734.

The product of its digits is 3386880, while the sum is 53.

The spelling of 126358721873 in words is "one hundred twenty-six billion, three hundred fifty-eight million, seven hundred twenty-one thousand, eight hundred seventy-three".