11773412561 has 4 divisors (see below), whose sum is σ = 11775126000. Its totient is φ = 11771699124.

The previous prime is 11773412557. The next prime is 11773412579. The reversal of 11773412561 is 16521437711.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 11773412561 - 2² = 11773412557 is a prime.

It is a super-2 number, since 2×11773412561² (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 (11773412461) 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, 846371 + ... + 860168.

It is an arithmetic number, because the mean of its divisors is an integer number (2943781500).

Almost surely, 2^11773412561 is an apocalyptic number.

It is an amenable number.

11773412561 is a deficient number, since it is larger than the sum of its proper divisors (1713439).

11773412561 is an equidigital number, since it uses as much as digits as its factorization.

11773412561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713438.

The product of its digits is 35280, while the sum is 38.

The spelling of 11773412561 in words is "eleven billion, seven hundred seventy-three million, four hundred twelve thousand, five hundred sixty-one".