11746537409 has 4 divisors (see below), whose sum is σ = 12364776240. Its totient is φ = 11128298580.

The previous prime is 11746537399. The next prime is 11746537421. The reversal of 11746537409 is 90473564711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90473564711 = 179 ⋅505438909.

It is a cyclic number.

It is not a de Polignac number, because 11746537409 - 2²⁴ = 11729760193 is a prime.

It is a super-2 number, since 2×11746537409² (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 (11746537009) 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, 309119387 + ... + 309119424.

It is an arithmetic number, because the mean of its divisors is an integer number (3091194060).

Almost surely, 2^11746537409 is an apocalyptic number.

11746537409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11746537409 is a deficient number, since it is larger than the sum of its proper divisors (618238831).

11746537409 is an equidigital number, since it uses as much as digits as its factorization.

11746537409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618238830.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 11746537409 in words is "eleven billion, seven hundred forty-six million, five hundred thirty-seven thousand, four hundred nine".