126388751251 has 4 divisors (see below), whose sum is σ = 144444287152. Its totient is φ = 108333215352.

The previous prime is 126388751243. The next prime is 126388751263. The reversal of 126388751251 is 152157883621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152157883621 = 37 ⋅4112375233.

It is a cyclic number.

It is not a de Polignac number, because 126388751251 - 2³ = 126388751243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126388751195 and 126388751204.

It is not an unprimeable number, because it can be changed into a prime (126388751351) 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, 9027767940 + ... + 9027767953.

It is an arithmetic number, because the mean of its divisors is an integer number (36111071788).

Almost surely, 2^126388751251 is an apocalyptic number.

126388751251 is a deficient number, since it is larger than the sum of its proper divisors (18055535901).

126388751251 is an equidigital number, since it uses as much as digits as its factorization.

126388751251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055535900.

The product of its digits is 806400, while the sum is 49.

The spelling of 126388751251 in words is "one hundred twenty-six billion, three hundred eighty-eight million, seven hundred fifty-one thousand, two hundred fifty-one".