11621461300561 has 4 divisors (see below), whose sum is σ = 13281670057792. Its totient is φ = 9961252543332.

The previous prime is 11621461300513. The next prime is 11621461300567. The reversal of 11621461300561 is 16500316412611.

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 11621461300561 - 2¹⁷ = 11621461169489 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 11621461300561.

It is not an unprimeable number, because it can be changed into a prime (11621461300567) 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, 830104378605 + ... + 830104378618.

It is an arithmetic number, because the mean of its divisors is an integer number (3320417514448).

Almost surely, 2^{11621461300561} is an apocalyptic number.

It is an amenable number.

11621461300561 is a deficient number, since it is larger than the sum of its proper divisors (1660208757231).

11621461300561 is an equidigital number, since it uses as much as digits as its factorization.

11621461300561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660208757230.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 11621461300561 in words is "eleven trillion, six hundred twenty-one billion, four hundred sixty-one million, three hundred thousand, five hundred sixty-one".