126750762509 has 4 divisors (see below), whose sum is σ = 144858014304. Its totient is φ = 108643510716.

The previous prime is 126750762469. The next prime is 126750762511. The reversal of 126750762509 is 905267057621.

It is a happy number.

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 not a de Polignac number, because 126750762509 - 2¹² = 126750758413 is a prime.

It is a super-2 number, since 2×126750762509² (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 (126750762529) 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, 9053625887 + ... + 9053625900.

It is an arithmetic number, because the mean of its divisors is an integer number (36214503576).

Almost surely, 2^126750762509 is an apocalyptic number.

It is an amenable number.

126750762509 is a deficient number, since it is larger than the sum of its proper divisors (18107251795).

126750762509 is an equidigital number, since it uses as much as digits as its factorization.

126750762509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18107251794.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 126750762509 in words is "one hundred twenty-six billion, seven hundred fifty million, seven hundred sixty-two thousand, five hundred nine".