11451323661 has 4 divisors (see below), whose sum is σ = 15268431552. Its totient is φ = 7634215772.

The previous prime is 11451323633. The next prime is 11451323677. The reversal of 11451323661 is 16632315411.

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 11451323661 - 2¹⁰ = 11451322637 is a prime.

It is a super-2 number, since 2×11451323661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11451323861) 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, 1908553941 + ... + 1908553946.

It is an arithmetic number, because the mean of its divisors is an integer number (3817107888).

Almost surely, 2^11451323661 is an apocalyptic number.

It is an amenable number.

11451323661 is a deficient number, since it is larger than the sum of its proper divisors (3817107891).

11451323661 is an equidigital number, since it uses as much as digits as its factorization.

11451323661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817107890.

The product of its digits is 12960, while the sum is 33.

The spelling of 11451323661 in words is "eleven billion, four hundred fifty-one million, three hundred twenty-three thousand, six hundred sixty-one".