11785387019 has 4 divisors (see below), whose sum is σ = 13469013744. Its totient is φ = 10101760296.

The previous prime is 11785386989. The next prime is 11785387063. The reversal of 11785387019 is 91078358711.

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 11785387019 - 2²⁴ = 11768609803 is a prime.

It is a super-2 number, since 2×11785387019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11785387619) 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, 841813352 + ... + 841813365.

It is an arithmetic number, because the mean of its divisors is an integer number (3367253436).

Almost surely, 2^11785387019 is an apocalyptic number.

11785387019 is a deficient number, since it is larger than the sum of its proper divisors (1683626725).

11785387019 is an equidigital number, since it uses as much as digits as its factorization.

11785387019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683626724.

The product of its (nonzero) digits is 423360, while the sum is 50.

The spelling of 11785387019 in words is "eleven billion, seven hundred eighty-five million, three hundred eighty-seven thousand, nineteen".