126781711919 has 4 divisors (see below), whose sum is σ = 128673976344. Its totient is φ = 124889447496.

The previous prime is 126781711879. The next prime is 126781711949. The reversal of 126781711919 is 919117187621.

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 126781711919 - 2⁸ = 126781711663 is a prime.

It is a super-2 number, since 2×126781711919² (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 (126781711949) 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, 946132112 + ... + 946132245.

It is an arithmetic number, because the mean of its divisors is an integer number (32168494086).

Almost surely, 2^126781711919 is an apocalyptic number.

126781711919 is a deficient number, since it is larger than the sum of its proper divisors (1892264425).

126781711919 is an equidigital number, since it uses as much as digits as its factorization.

126781711919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892264424.

The product of its digits is 381024, while the sum is 53.

The spelling of 126781711919 in words is "one hundred twenty-six billion, seven hundred eighty-one million, seven hundred eleven thousand, nine hundred nineteen".