126501256051 has 4 divisors (see below), whose sum is σ = 126544625872. Its totient is φ = 126457886232.

The previous prime is 126501256043. The next prime is 126501256061. The reversal of 126501256051 is 150652105621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150652105621 = 59 ⋅2553425519.

It is a cyclic number.

It is not a de Polignac number, because 126501256051 - 2³ = 126501256043 is a prime.

It is a super-2 number, since 2×126501256051² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126501255998 and 126501256016.

It is not an unprimeable number, because it can be changed into a prime (126501256061) 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, 21680535 + ... + 21686368.

It is an arithmetic number, because the mean of its divisors is an integer number (31636156468).

Almost surely, 2^126501256051 is an apocalyptic number.

126501256051 is a deficient number, since it is larger than the sum of its proper divisors (43369821).

126501256051 is an equidigital number, since it uses as much as digits as its factorization.

126501256051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43369820.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 126501256051 in words is "one hundred twenty-six billion, five hundred one million, two hundred fifty-six thousand, fifty-one".