11774256521 has 4 divisors (see below), whose sum is σ = 11839307844. Its totient is φ = 11709205200.

The previous prime is 11774256479. The next prime is 11774256541. The reversal of 11774256521 is 12565247711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2348759296 + 9425497225 = 48464^2 + 97085^2 .

It is a cyclic number.

It is not a de Polignac number, because 11774256521 - 2²⁶ = 11707147657 is a prime.

It is a super-2 number, since 2×11774256521² (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 (11774256541) 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, 32525390 + ... + 32525751.

It is an arithmetic number, because the mean of its divisors is an integer number (2959826961).

Almost surely, 2^11774256521 is an apocalyptic number.

It is an amenable number.

11774256521 is a deficient number, since it is larger than the sum of its proper divisors (65051323).

11774256521 is an equidigital number, since it uses as much as digits as its factorization.

11774256521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65051322.

The product of its digits is 117600, while the sum is 41.

The spelling of 11774256521 in words is "eleven billion, seven hundred seventy-four million, two hundred fifty-six thousand, five hundred twenty-one".