11621456641 has 4 divisors (see below), whose sum is σ = 11630762500. Its totient is φ = 11612150784.

The previous prime is 11621456621. The next prime is 11621456653. The reversal of 11621456641 is 14665412611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14665412611 = 37 ⋅396362503.

It can be written as a sum of positive squares in 2 ways, for example, as 7413210000 + 4208246641 = 86100^2 + 64871^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621456641 - 2¹⁹ = 11620932353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11621456641.

It is not an unprimeable number, because it can be changed into a prime (11621456611) 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, 4651056 + ... + 4653553.

It is an arithmetic number, because the mean of its divisors is an integer number (2907690625).

Almost surely, 2^11621456641 is an apocalyptic number.

It is an amenable number.

11621456641 is a deficient number, since it is larger than the sum of its proper divisors (9305859).

11621456641 is an equidigital number, since it uses as much as digits as its factorization.

11621456641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9305858.

The product of its digits is 34560, while the sum is 37.

The spelling of 11621456641 in words is "eleven billion, six hundred twenty-one million, four hundred fifty-six thousand, six hundred forty-one".