11975578273 has 4 divisors (see below), whose sum is σ = 12017895088. Its totient is φ = 11933261460.

The previous prime is 11975578261. The next prime is 11975578313. The reversal of 11975578273 is 37287557911.

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: 37287557911 = 29 ⋅1285777859.

It is a cyclic number.

It is not a de Polignac number, because 11975578273 - 2¹⁷ = 11975447201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11975578213) 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, 21157983 + ... + 21158548.

It is an arithmetic number, because the mean of its divisors is an integer number (3004473772).

Almost surely, 2^11975578273 is an apocalyptic number.

It is an amenable number.

11975578273 is a deficient number, since it is larger than the sum of its proper divisors (42316815).

11975578273 is an equidigital number, since it uses as much as digits as its factorization.

11975578273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42316814.

The product of its digits is 3704400, while the sum is 55.

It can be divided in two parts, 1197 and 5578273, that added together give a triangular number (5579470 = T₃₃₄₀).

The spelling of 11975578273 in words is "eleven billion, nine hundred seventy-five million, five hundred seventy-eight thousand, two hundred seventy-three".