126789162509 has 4 divisors (see below), whose sum is σ = 132301734816. Its totient is φ = 121276590204.

The previous prime is 126789162503. The next prime is 126789162557. The reversal of 126789162509 is 905261987621.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126789162509 is a prime.

It is a super-2 number, since 2×126789162509² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126789162503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2756286119 + ... + 2756286164.

It is an arithmetic number, because the mean of its divisors is an integer number (33075433704).

Almost surely, 2^126789162509 is an apocalyptic number.

It is an amenable number.

126789162509 is a deficient number, since it is larger than the sum of its proper divisors (5512572307).

126789162509 is an equidigital number, since it uses as much as digits as its factorization.

126789162509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512572306.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 126789162509 in words is "one hundred twenty-six billion, seven hundred eighty-nine million, one hundred sixty-two thousand, five hundred nine".