126123452551 has 4 divisors (see below), whose sum is σ = 126504490504. Its totient is φ = 125742414600.

The previous prime is 126123452537. The next prime is 126123452573. The reversal of 126123452551 is 155254321621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126123452551 - 2⁵ = 126123452519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126123452551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126123432551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190518480 + ... + 190519141.

It is an arithmetic number, because the mean of its divisors is an integer number (31626122626).

Almost surely, 2^126123452551 is an apocalyptic number.

126123452551 is a deficient number, since it is larger than the sum of its proper divisors (381037953).

126123452551 is an equidigital number, since it uses as much as digits as its factorization.

126123452551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381037952.

The product of its digits is 72000, while the sum is 37.

The spelling of 126123452551 in words is "one hundred twenty-six billion, one hundred twenty-three million, four hundred fifty-two thousand, five hundred fifty-one".